Nitrogen

Formula: N₂
Molecular weight: 28.0134
IUPAC Standard InChI: InChI=1S/N2/c1-2
IUPAC Standard InChIKey: IJGRMHOSHXDMSA-UHFFFAOYSA-N
CAS Registry Number: 7727-37-9
Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript.
Other names: Nitrogen gas; N2; UN 1066; UN 1977; Dinitrogen; Molecular nitrogen; Diatomic nitrogen; Nitrogen-14
Permanent link for this species. Use this link for bookmarking this species for future reference.
Information on this page:
Other data available:
- Phase change data
- Reaction thermochemistry data: reactions 51 to 100, reactions 101 to 150, reactions 151 to 156
- Henry's Law data
- Mass spectrum (electron ionization)
- Constants of diatomic molecules
- Fluid Properties
Data at other public NIST sites:
- Electron-Impact Ionization Cross Sections (on physics web site)
- Gas Phase Kinetics Database
Options:
- Switch to SI units

Data at NIST subscription sites:

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.

Gas phase thermochemistry data

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, References, Notes

Quantity	Value	Units	Method	Reference	Comment
S°_{gas,1 bar}	45.7957 ± 0.001	cal/mol*K	Review	Cox, Wagman, et al., 1984	CODATA Review value
S°_{gas,1 bar}	45.796	cal/mol*K	Review	Chase, 1998	Data last reviewed in March, 1977

Gas Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
C_p = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.

View plot Requires a JavaScript / HTML 5 canvas capable browser.

View table.

Temperature (K)	100. to 500.	500. to 2000.	2000. to 6000.
A	6.927919	4.662006	8.489178
B	0.443111	4.753120	0.269772
C	-2.305798	-2.055099	-0.046870
D	3.975949	0.327386	0.003504
E	0.000028	0.126100	-1.088375
F	-2.072637	-1.179542	-4.534157
G	54.11491	50.76243	53.77175
H	0.0	0.0	0.0
Reference	Chase, 1998	Chase, 1998	Chase, 1998
Comment	Data last reviewed in March, 1977; New parameter fit January 2009	Data last reviewed in March, 1977; New parameter fit January 2009	Data last reviewed in March, 1977; New parameter fit January 2009

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, References, Notes

Data compiled as indicated in comments:
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
MS - José A. Martinho Simões
B - John E. Bartmess
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Reactions 1 to 50

+ Nitrogen = ( • )

By formula: NO^- + N₂ = (NO^- • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.6 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Δ_rH°	4.7	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; Δ_rS+-2.9 cal/mol*K; M
Δ_rH°	4.4	kcal/mol	HPMS	Speller, Fitaire, et al., 1983	gas phase; Entropy change is questionable; M
Δ_rH°	5.2	kcal/mol	HPMS	Turner and Conway, 1976	gas phase; M
Δ_rH°	4.5	kcal/mol	DT	Johnsen, Huang, et al., 1975	gas phase; corrected for ln T by Keesee and Castleman, 1986; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.0	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Δ_rS°	13.8	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; Δ_rS+-2.9 cal/mol*K; M
Δ_rS°	13.3	cal/mol*K	HPMS	Speller, Fitaire, et al., 1983	gas phase; Entropy change is questionable; M
Δ_rS°	18.9	cal/mol*K	HPMS	Turner and Conway, 1976	gas phase; M
Δ_rS°	15.7	cal/mol*K	DT	Johnsen, Huang, et al., 1975	gas phase; corrected for ln T by Keesee and Castleman, 1986; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.5	200.	FA	Dunkin, Fehsenfeld, et al., 1971	gas phase; M

+ Nitrogen = ( • )

By formula: N₂⁺ + N₂ = (N₂⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	24.4 to 24.4	kcal/mol	RNG	N/A	Range of 6 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.0	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rS°	16.2	cal/mol*K	PHPMS	Teng and Conway, 1973	gas phase; M
Δ_rS°	19.5	cal/mol*K	PHPMS	Payzant and Kebarle, 1970	gas phase; M
Δ_rS°	11.	cal/mol*K	DT	Varney, 1968	gas phase; Entropy change is questionable; M
Δ_rS°	-1.	cal/mol*K	DT	Varney, 1959	gas phase; Entropy change is questionable; M

+ Nitrogen = ( • )

By formula: O₂⁺ + N₂ = (O₂⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.0 ± 0.3	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rH°	5.2	kcal/mol	HPMS	Speller and Fitaire, 1983	gas phase; M
Δ_rH°	5.7	kcal/mol	PHPMS	Janik and Conway, 1967	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.4	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rS°	15.8	cal/mol*K	HPMS	Speller and Fitaire, 1983	gas phase; M
Δ_rS°	18.9	cal/mol*K	PHPMS	Janik and Conway, 1967	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.0	296.	FA	Howard, Bierbaum, et al., 1972	gas phase; M

(HN₂⁺ • 4 Nitrogen ) + = (HN₂⁺ • 5)

By formula: (HN₂⁺ • 4N₂) + N₂ = (HN₂⁺ • 5N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.0 ± 0.3	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	3.2	kcal/mol	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	22.9	cal/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	20.	cal/mol*K	N/A	Hiraoka, Saluja, et al., 1979	gas phase; Entropy change calculated or estimated; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
1.4	92.	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; Entropy change calculated or estimated; M

( • 7 Nitrogen • ) + = ( • 8 • )

By formula: (O₂^- • 7N₂ • O₂) + N₂ = (O₂^- • 8N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.6 ± 0.3	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Δ_rH°	1.53	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.9	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M
Δ_rS°	18.0	cal/mol*K	N/A	Hiraoka, 1988	gas phase; Entropy change calculated or estimated; M

( • 2 Nitrogen ) + = ( • 3)

By formula: (O₂⁺ • 2N₂) + N₂ = (O₂⁺ • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.2 ± 0.3	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rH°	3.5	kcal/mol	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.6	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rS°	12.1	cal/mol*K	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M

( • Nitrogen ) + = ( • 2)

By formula: (O₂⁺ • N₂) + N₂ = (O₂⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.5 ± 0.3	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rH°	4.3	kcal/mol	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.1	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rS°	13.8	cal/mol*K	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M

( • Nitrogen ) + = ( • 2)

By formula: (NO^- • N₂) + N₂ = (NO^- • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.2 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Δ_rH°	3.9	kcal/mol	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.4	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Δ_rS°	12.6	cal/mol*K	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M

C₃N₂NiO₃ (solution) = C₃NiO₃ (solution) + Nitrogen (solution)

By formula: C₃N₂NiO₃ (solution) = C₃NiO₃ (solution) + N₂ (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10. ± 1.	kcal/mol	KinS	Turner, Simpson, et al., 1983	solvent: Liquid krypton; The reaction enthalpy relies on the experimental value for the activation enthalpy, 10. ± 1. kcal/mol, and on the assumption that the activation enthalpy for product recombination is negligible Turner, Simpson, et al., 1983.; MS

N⁺ + Nitrogen = (N⁺ • )

By formula: N⁺ + N₂ = (N⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	59.4	kcal/mol	N/A	National Bureau of Standards, 1968	gas phase; from Δ_rH(f); M
Δ_rH°	60.	kcal/mol	EI	Saporoschenko, 1965	gas phase; M
Δ_rH°	59.	kcal/mol	EI	Franklin, Dibeler, et al., 1958	gas phase; M

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
86.2 (+1.8,-0.)		CID	Haynes, Freysinger, et al., 1995	gas phase; guided ion beam CID; M

+ Nitrogen = ( • )

By formula: Cu⁺ + N₂ = (Cu⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.2	kcal/mol	HPMS	El-Shall, Schriver, et al., 1989	gas phase; Cu+ from laser desrption; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.	cal/mol*K	HPMS	El-Shall, Schriver, et al., 1989	gas phase; Cu+ from laser desrption; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1.4	kcal/mol	HPMS	El-Shall, Schriver, et al., 1989	gas phase; Cu+ from laser desrption; M

(HN₂⁺ • 2 Nitrogen ) + = (HN₂⁺ • 3)

By formula: (HN₂⁺ • 2N₂) + N₂ = (HN₂⁺ • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.4 ± 0.3	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	3.8	kcal/mol	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.1	cal/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	20.	cal/mol*K	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M

(HN₂⁺ • 3 Nitrogen ) + = (HN₂⁺ • 4)

By formula: (HN₂⁺ • 3N₂) + N₂ = (HN₂⁺ • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.3 ± 0.3	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	3.5	kcal/mol	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.2	cal/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	20.	cal/mol*K	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M

(HN₂⁺ • Nitrogen ) + = (HN₂⁺ • 2)

By formula: (HN₂⁺ • N₂) + N₂ = (HN₂⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.6 ± 0.3	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	4.0	kcal/mol	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.2	cal/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	18.	cal/mol*K	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M

+ Nitrogen = ( • )

By formula: Na⁺ + N₂ = (Na⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.0	kcal/mol	FA	Perry, Rowe, et al., 1980	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.6	cal/mol*K	FA	Perry, Rowe, et al., 1980	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
2.2	310.	FA	Perry, Rowe, et al., 1980	gas phase; M
2.0	310.	DT	Beyer and Keller, 1971	gas phase; low E/N; M

HN₂⁺ + Nitrogen = (HN₂⁺ • )

By formula: HN₂⁺ + N₂ = (HN₂⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	16.0	kcal/mol	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M
Δ_rH°	14.5	kcal/mol	PHPMS	Meot-Ner (Mautner) and Field, 1974	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	24.	cal/mol*K	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M
Δ_rS°	20.4	cal/mol*K	PHPMS	Meot-Ner (Mautner) and Field, 1974	gas phase; M

C₃₉H₆₆N₂O₃P₂W (solution) + (g) = C₃₉H₆₈O₃P₂W (solution) + Nitrogen (g)

By formula: C₃₉H₆₆N₂O₃P₂W (solution) + H₂ (g) = C₃₉H₆₈O₃P₂W (solution) + N₂ (g)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.40 ± 0.41	kcal/mol	EqS	Gonzalez and Hoff, 1989	solvent: Tetrahydrofuran; Temperature range: 288-308 K; MS

C₃₉H₆₆MoO₃P₃ (solution) + Nitrogen (g) = C₃₉H₆₆MoN₂O₃P₂ (solution)

By formula: C₃₉H₆₆MoO₃P₃ (solution) + N₂ (g) = C₃₉H₆₆MoN₂O₃P₂ (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-9.01 ± 0.60	kcal/mol	EqS	Gonzalez and Hoff, 1989	solvent: Tetrahydrofuran; Temperature range: 294-308 K; MS

( • 2 Nitrogen • 3) + = ( • 3 • 3)

By formula: (H₃O⁺ • 2N₂ • 3H₂O) + N₂ = (H₃O⁺ • 3N₂ • 3H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.2	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; Δ_rH, Δ_rS approximate; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	6.4	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; Δ_rH, Δ_rS approximate; M

( • 4 Nitrogen ) + = ( • 5)

By formula: (O₂⁺ • 4N₂) + N₂ = (O₂⁺ • 5N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.7 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.2	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.7	184.	HPMS	Speller and Fitaire, 1983	gas phase; M

( • 2 Nitrogen ) + = ( • 3)

By formula: (NO^- • 2N₂) + N₂ = (NO^- • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.8 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.8	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.9	204.	HPMS	Speller, Fitaire, et al., 1983	gas phase; M

( • 3 Nitrogen ) + = ( • 4)

By formula: (NO^- • 3N₂) + N₂ = (NO^- • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.4 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.9	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.4	204.	HPMS	Speller, Fitaire, et al., 1983	gas phase; M

( • 3 Nitrogen ) + = ( • 4)

By formula: (O₂⁺ • 3N₂) + N₂ = (O₂⁺ • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.0 ± 0.3	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	22.5	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.7	204.	HPMS	Speller and Fitaire, 1983	gas phase; M

( • 3 Nitrogen • 2) + = ( • 4 • 2)

By formula: (H₃O⁺ • 3N₂ • 2H₂O) + N₂ = (H₃O⁺ • 4N₂ • 2H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; Δ_rH, Δ_rS approximate; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	12.	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; Δ_rH, Δ_rS approximate; M

( • 9 Nitrogen ) + = ( • 10)

By formula: (NO^- • 9N₂) + N₂ = (NO^- • 10N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.68	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.	cal/mol*K	N/A	Hiraoka and Yamabe, 1989	gas phase; Entropy change calculated or estimated; M

(HN₂⁺ • 10 Nitrogen ) + = (HN₂⁺ • 11)

By formula: (HN₂⁺ • 10N₂) + N₂ = (HN₂⁺ • 11N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.72	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	22.	cal/mol*K	N/A	Hiraoka and Mori, 1989	gas phase; Entropy change calculated or estimated; M

O₃^- + Nitrogen = (O₃^- • )

By formula: O₃^- + N₂ = (O₃^- • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.70 ± 0.20	kcal/mol	TDAs	Hiraoka, 1988	gas phase; B,M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.4	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-2.80 ± 0.50	kcal/mol	TDAs	Hiraoka, 1988	gas phase; B

(C₂H₅⁺ • Nitrogen ) + = (C₂H₅⁺ • 2)

By formula: (C₂H₅⁺ • N₂) + N₂ = (C₂H₅⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.6	kcal/mol	HPMS	Speller, 1983	gas phase; deuterated, Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	10.9	cal/mol*K	HPMS	Speller, 1983	gas phase; deuterated, Entropy change is questionable; M

( • Nitrogen ) + = ( • 2)

By formula: (N₂⁺ • N₂) + N₂ = (N₂⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.8 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rH°	1.4	kcal/mol	PI	Linn, Ono, et al., 1981	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	15.0	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • ) + Nitrogen = ( • • )

By formula: (O₂⁺ • O₂) + N₂ = (O₂⁺ • N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.9	kcal/mol	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	10.1	cal/mol*K	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M

( • Nitrogen ) + = ( • 2)

By formula: (Na⁺ • N₂) + N₂ = (Na⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.3	kcal/mol	FA	Perry, Rowe, et al., 1980	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.8	cal/mol*K	FA	Perry, Rowe, et al., 1980	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
-0.3	310.	FA	Perry, Rowe, et al., 1980	gas phase; M

(CH₂N⁺ • 2 Nitrogen ) + = (CH₂N⁺ • 3)

By formula: (CH₂N⁺ • 2N₂) + N₂ = (CH₂N⁺ • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.2	kcal/mol	HPMS	Speller, Fitaire, et al., 1982	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	13.1	cal/mol*K	HPMS	Speller, Fitaire, et al., 1982	gas phase; Entropy change is questionable; M

(CH₂N⁺ • 3 Nitrogen ) + = (CH₂N⁺ • 4)

By formula: (CH₂N⁺ • 3N₂) + N₂ = (CH₂N⁺ • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.1	kcal/mol	HPMS	Speller, Fitaire, et al., 1982	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	13.8	cal/mol*K	HPMS	Speller, Fitaire, et al., 1982	gas phase; Entropy change is questionable; M

(CH₂N⁺ • 4 Nitrogen ) + = (CH₂N⁺ • 5)

By formula: (CH₂N⁺ • 4N₂) + N₂ = (CH₂N⁺ • 5N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.2	kcal/mol	HPMS	Speller, Fitaire, et al., 1982	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	15.2	cal/mol*K	HPMS	Speller, Fitaire, et al., 1982	gas phase; Entropy change is questionable; M

+ 0.5 = + + 0.5 Nitrogen

By formula: C₄H₄BrNO₂ + 0.5H₄N₂ = HBr + C₄H₅NO₂ + 0.5N₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-62.22 ± 0.11	kcal/mol	Cm	Howard and Skinner, 1966	solid phase; solvent: Aqueous solution; Reanalyzed by Pedley, Naylor, et al., 1986, Original value = -62.55 ± 0.11 kcal/mol; ALS

+ Nitrogen = ( • )

By formula: O₂^- + N₂ = (O₂^- • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.0 ± 1.0	kcal/mol	N/A	Posey and Johnson, 1988	gas phase; B
Δ_rH°	<13.60	kcal/mol	IMRB	Adams and Bohme, 1970	gas phase; N₂..O₂^- + O₂ -> O₄^-; B

C₁₂H₃₄P₄Ru (solution) + Nitrogen (solution) = C₁₂H₃₂N₂P₄Ru (solution) + (solution)

By formula: C₁₂H₃₄P₄Ru (solution) + N₂ (solution) = C₁₂H₃₂N₂P₄Ru (solution) + H₂ (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.90	kcal/mol	PAC	Belt, Scaiano, et al., 1993	solvent: Cyclohexane; The reaction enthalpy relies on 0.85 for the quantum yield of H2 dissociation.; MS

( • 2 Nitrogen • 2) + = ( • 3 • 2)

By formula: (H₃O⁺ • 2N₂ • 2H₂O) + N₂ = (H₃O⁺ • 3N₂ • 2H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.0 ± 2.7	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	28.4	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; M

(solution) + Nitrogen (solution) = C₈H₅N₂O₃V (solution) + (solution)

By formula: C₉H₅O₄V (solution) + N₂ (solution) = C₈H₅N₂O₃V (solution) + CO (solution)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.5 ± 1.	kcal/mol	PAC	Johnson, Popov, et al., 1991	solvent: Heptane; The reaction enthalpy relies on 0.80 for the quantum yield of CO dissociation.; MS

( • 2 Nitrogen • ) + = ( • 3 • )

By formula: (O₂^- • 2N₂ • O₂) + N₂ = (O₂^- • 3N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.5 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.3	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

( • 3 Nitrogen • ) + = ( • 4 • )

By formula: (O₂^- • 3N₂ • O₂) + N₂ = (O₂^- • 4N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.2 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.7	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

( • 4 Nitrogen • ) + = ( • 5 • )

By formula: (O₂^- • 4N₂ • O₂) + N₂ = (O₂^- • 5N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.9 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.5	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

( • 5 Nitrogen • ) + = ( • 6 • )

By formula: (O₂^- • 5N₂ • O₂) + N₂ = (O₂^- • 6N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.8 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.5	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

( • 6 Nitrogen • ) + = ( • 7 • )

By formula: (O₂^- • 6N₂ • O₂) + N₂ = (O₂^- • 7N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.7 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.8	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

( • Nitrogen • ) + = ( • 2 • )

By formula: (O₂^- • N₂ • O₂) + N₂ = (O₂^- • 2N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.8 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.9	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

( • 2 Nitrogen • ) + = ( • 3 • )

By formula: (H₃O⁺ • 2N₂ • H₂O) + N₂ = (H₃O⁺ • 3N₂ • H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8. ± 2.	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	22.	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; M

( • Nitrogen • 2) + = ( • 2 • 2)

By formula: (H₃O⁺ • N₂ • 2H₂O) + N₂ = (H₃O⁺ • 2N₂ • 2H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.2	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.6	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; M

( • Nitrogen • 3) + = ( • 2 • 3)

By formula: (H₃O⁺ • N₂ • 3H₂O) + N₂ = (H₃O⁺ • 2N₂ • 3H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.4	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	15.7	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; M

( • 10 Nitrogen ) + = ( • 11)

By formula: (O₂⁺ • 10N₂) + N₂ = (O₂⁺ • 11N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.4 ± 0.3	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.2	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 10 Nitrogen ) + = ( • 11)

By formula: (N₂⁺ • 10N₂) + N₂ = (N₂⁺ • 11N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.7 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.2	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Ion clustering data, References, Notes

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to N₂⁺ (ion structure unspecified)

Quantity	Value	Units	Method	Reference	Comment
IE (evaluated)	15.581 ± 0.008	eV	N/A	N/A	L
Quantity	Value	Units	Method	Reference	Comment
Proton affinity (review)	118.0	kcal/mol	N/A	Hunter and Lias, 1998	HL
Quantity	Value	Units	Method	Reference	Comment
Gas basicity	111.0	kcal/mol	N/A	Hunter and Lias, 1998	HL

Ionization energy determinations

IE (eV)	Method	Reference	Comment
15.581 ± 0.008	S	Trickl, Cromwell, et al., 1989	LL
15.7 ± 0.1	EI	Stephen, Mark, et al., 1984	LBLHLM
15.6 ± 0.1	EI	Grade, Wienecke, et al., 1983	LBLHLM
15.60	PE	Kimura, Katsumata, et al., 1981	LLK
10.1 ± 0.6	EI	Armentrout, Tarr, et al., 1981	LLK
15.58	EI	Armentrout, Tarr, et al., 1981	LLK
15.5808	EVAL	Huber and Herzberg, 1979	LLK
15.58 ± 0.02	EI	Sahini, Constantin, et al., 1978	LLK
15.5	PI	Rabalais, Debies, et al., 1974	LLK
15.58	PE	Lee and Rabalais, 1974	LLK
15.61	PE	Natalis, 1973	LLK
15.58 ± 0.01	PE	Hotop and Niehaus, 1970	RDSH
15.56	CI	Cermak, 1968	RDSH
15.58	PI	Cook and Metzger, 1964	RDSH
15.5803	S	Ogawa and Tanaka, 1962	RDSH
15.5802	S	Worley, 1943	RDSH
15.5812 ± 0.0002	S	Worley and Jenkins, 1938	RDSH
15.58	PE	Potts and Williams, 1974	Vertical value; LLK
15.60	PE	Katrib, Debies, et al., 1973	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
N⁺	24.34	N(4So)	EI	Locht, Schopman, et al., 1975	LLK
N⁺	24.3	N	EI	Smyth, Schiavone, et al., 1973	LLK
N⁺	24.4 ± 0.25	N	EI	Crowe and McConkey, 1973	LLK
N⁺	24.32 ± 0.03	N	EI	Hierl and Franklin, 1967	RDSH
N⁺	48. ± 2.	N⁺	EI	Hierl and Franklin, 1967	RDSH
N⁺	24.32 ± 0.02	N	EI	Frost and McDowell, 1956	RDSH

Ion clustering data

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, References, Notes

Data compiled as indicated in comments:
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
RCD - Robert C. Dunbar
B - John E. Bartmess

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

Ar⁺ + Nitrogen = (Ar⁺ • )

By formula: Ar⁺ + N₂ = (Ar⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	39.2	kcal/mol	FA	Shul, Passarella, et al., 1987	gas phase; switching reaction(Ar+)Ar, Δ_rH>; Dehmer and Pratt, 1982; M

+ Nitrogen = ( • )

By formula: CF₃⁺ + N₂ = (CF₃⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.0	kcal/mol	PHPMS	Hiraoka, Nasu, et al., 1996	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	24.	cal/mol*K	PHPMS	Hiraoka, Nasu, et al., 1996	gas phase; M

( • Nitrogen ) + = ( • 2)

By formula: (CF₃⁺ • N₂) + N₂ = (CF₃⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.1	kcal/mol	PHPMS	Hiraoka, Nasu, et al., 1996	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	22.	cal/mol*K	PHPMS	Hiraoka, Nasu, et al., 1996	gas phase; M

( • 2 Nitrogen ) + = ( • 3)

By formula: (CF₃⁺ • 2N₂) + N₂ = (CF₃⁺ • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.0	kcal/mol	PHPMS	Hiraoka, Nasu, et al., 1996	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	13.	cal/mol*K	PHPMS	Hiraoka, Nasu, et al., 1996	gas phase; M

( • 3 Nitrogen ) + = ( • 4)

By formula: (CF₃⁺ • 3N₂) + N₂ = (CF₃⁺ • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.8	kcal/mol	PHPMS	Hiraoka, Nasu, et al., 1996	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	14.	cal/mol*K	PHPMS	Hiraoka, Nasu, et al., 1996	gas phase; M

( • 4 Nitrogen ) + = ( • 5)

By formula: (CF₃⁺ • 4N₂) + N₂ = (CF₃⁺ • 5N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.5	kcal/mol	PHPMS	Hiraoka, Nasu, et al., 1996	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	12.	cal/mol*K	PHPMS	Hiraoka, Nasu, et al., 1996	gas phase; M

CH₂N⁺ + Nitrogen = (CH₂N⁺ • )

By formula: CH₂N⁺ + N₂ = (CH₂N⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.6	kcal/mol	HPMS	Speller, Fitaire, et al., 1982	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	22.2	cal/mol*K	HPMS	Speller, Fitaire, et al., 1982	gas phase; M

(CH₂N⁺ • Nitrogen ) + = (CH₂N⁺ • 2)

By formula: (CH₂N⁺ • N₂) + N₂ = (CH₂N⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.1	kcal/mol	HPMS	Speller, Fitaire, et al., 1982	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.9	cal/mol*K	HPMS	Speller, Fitaire, et al., 1982	gas phase; M

(CH₂N⁺ • 2 Nitrogen ) + = (CH₂N⁺ • 3)

By formula: (CH₂N⁺ • 2N₂) + N₂ = (CH₂N⁺ • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.2	kcal/mol	HPMS	Speller, Fitaire, et al., 1982	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	13.1	cal/mol*K	HPMS	Speller, Fitaire, et al., 1982	gas phase; Entropy change is questionable; M

(CH₂N⁺ • 3 Nitrogen ) + = (CH₂N⁺ • 4)

By formula: (CH₂N⁺ • 3N₂) + N₂ = (CH₂N⁺ • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.1	kcal/mol	HPMS	Speller, Fitaire, et al., 1982	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	13.8	cal/mol*K	HPMS	Speller, Fitaire, et al., 1982	gas phase; Entropy change is questionable; M

(CH₂N⁺ • 4 Nitrogen ) + = (CH₂N⁺ • 5)

By formula: (CH₂N⁺ • 4N₂) + N₂ = (CH₂N⁺ • 5N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.2	kcal/mol	HPMS	Speller, Fitaire, et al., 1982	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	15.2	cal/mol*K	HPMS	Speller, Fitaire, et al., 1982	gas phase; Entropy change is questionable; M

+ Nitrogen = ( • )

By formula: CH₃⁺ + N₂ = (CH₃⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	48.4	kcal/mol	PDiss	Foster, Williamson, et al., 1974	gas phase; M

CH₅⁺ + Nitrogen = (CH₅⁺ • )

By formula: CH₅⁺ + N₂ = (CH₅⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.8	kcal/mol	HPMS	Speller, 1983	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.7	cal/mol*K	HPMS	Speller, 1983	gas phase; M

C₂H₅⁺ + Nitrogen = (C₂H₅⁺ • )

By formula: C₂H₅⁺ + N₂ = (C₂H₅⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.9	kcal/mol	HPMS	Speller, 1983	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.2	cal/mol*K	HPMS	Speller, 1983	gas phase; M

(C₂H₅⁺ • Nitrogen ) + = (C₂H₅⁺ • 2)

By formula: (C₂H₅⁺ • N₂) + N₂ = (C₂H₅⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.6	kcal/mol	HPMS	Speller, 1983	gas phase; deuterated, Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	10.9	cal/mol*K	HPMS	Speller, 1983	gas phase; deuterated, Entropy change is questionable; M

+ Nitrogen = ( • )

By formula: Ca⁺ + N₂ = (Ca⁺ • N₂)

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
6.0	296.	FA	Spears and Fehsenfeld, 1972	gas phase; M

+ Nitrogen = ( • )

By formula: Cu⁺ + N₂ = (Cu⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.2	kcal/mol	HPMS	El-Shall, Schriver, et al., 1989	gas phase; Cu+ from laser desrption; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.	cal/mol*K	HPMS	El-Shall, Schriver, et al., 1989	gas phase; Cu+ from laser desrption; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1.4	kcal/mol	HPMS	El-Shall, Schriver, et al., 1989	gas phase; Cu+ from laser desrption; M

( • Nitrogen ) + = ( • 2)

By formula: (Cu⁺ • N₂) + N₂ = (Cu⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	2.9	kcal/mol	HPMS	El-Shall, Schriver, et al., 1989	gas phase; Cu+ from laser desorption, equilibrium?; M

( • 2 Nitrogen ) + = ( • 3)

By formula: (Cu⁺ • 2N₂) + N₂ = (Cu⁺ • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	2.4	kcal/mol	HPMS	El-Shall, Schriver, et al., 1989	gas phase; Cu+ from laser desorption; M

+ Nitrogen = ( • )

By formula: Fe⁺ + N₂ = (Fe⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	12.9 ± 1.4	kcal/mol	CIDT	Rodgers and Armentrout, 2000	RCD

( • Nitrogen ) + = ( • 2)

By formula: (Fe⁺ • N₂) + N₂ = (Fe⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	19.8 ± 2.2	kcal/mol	CIDT	Rodgers and Armentrout, 2000	RCD

( • 2 Nitrogen ) + = ( • 3)

By formula: (Fe⁺ • 2N₂) + N₂ = (Fe⁺ • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.8 ± 0.7	kcal/mol	CIDT	Rodgers and Armentrout, 2000	RCD

( • 3 Nitrogen ) + = ( • 4)

By formula: (Fe⁺ • 3N₂) + N₂ = (Fe⁺ • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	12.9 ± 1.0	kcal/mol	CIDT	Rodgers and Armentrout, 2000	RCD

( • 4 Nitrogen ) + = ( • 5)

By formula: (Fe⁺ • 4N₂) + N₂ = (Fe⁺ • 5N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	14.8 ± 1.0	kcal/mol	CIDT	Rodgers and Armentrout, 2000	RCD

HN₂⁺ + Nitrogen = (HN₂⁺ • )

By formula: HN₂⁺ + N₂ = (HN₂⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	16.0	kcal/mol	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M
Δ_rH°	14.5	kcal/mol	PHPMS	Meot-Ner (Mautner) and Field, 1974	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	24.	cal/mol*K	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M
Δ_rS°	20.4	cal/mol*K	PHPMS	Meot-Ner (Mautner) and Field, 1974	gas phase; M

(HN₂⁺ • Nitrogen ) + = (HN₂⁺ • 2)

By formula: (HN₂⁺ • N₂) + N₂ = (HN₂⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.6 ± 0.3	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	4.0	kcal/mol	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.2	cal/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	18.	cal/mol*K	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M

(HN₂⁺ • 2 Nitrogen ) + = (HN₂⁺ • 3)

By formula: (HN₂⁺ • 2N₂) + N₂ = (HN₂⁺ • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.4 ± 0.3	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	3.8	kcal/mol	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.1	cal/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	20.	cal/mol*K	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M

(HN₂⁺ • 3 Nitrogen ) + = (HN₂⁺ • 4)

By formula: (HN₂⁺ • 3N₂) + N₂ = (HN₂⁺ • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.3 ± 0.3	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	3.5	kcal/mol	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.2	cal/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	20.	cal/mol*K	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; M

(HN₂⁺ • 4 Nitrogen ) + = (HN₂⁺ • 5)

By formula: (HN₂⁺ • 4N₂) + N₂ = (HN₂⁺ • 5N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.0 ± 0.3	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rH°	3.2	kcal/mol	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	22.9	cal/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Δ_rS°	20.	cal/mol*K	N/A	Hiraoka, Saluja, et al., 1979	gas phase; Entropy change calculated or estimated; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
1.4	92.	PHPMS	Hiraoka, Saluja, et al., 1979	gas phase; Entropy change calculated or estimated; M

(HN₂⁺ • 5 Nitrogen ) + = (HN₂⁺ • 6)

By formula: (HN₂⁺ • 5N₂) + N₂ = (HN₂⁺ • 6N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.2 ± 0.3	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.9	cal/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(HN₂⁺ • 6 Nitrogen ) + = (HN₂⁺ • 7)

By formula: (HN₂⁺ • 6N₂) + N₂ = (HN₂⁺ • 7N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.0 ± 0.3	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.4	cal/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(HN₂⁺ • 7 Nitrogen ) + = (HN₂⁺ • 8)

By formula: (HN₂⁺ • 7N₂) + N₂ = (HN₂⁺ • 8N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.9 ± 0.3	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.5	cal/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(HN₂⁺ • 8 Nitrogen ) + = (HN₂⁺ • 9)

By formula: (HN₂⁺ • 8N₂) + N₂ = (HN₂⁺ • 9N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.8 ± 0.3	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.8	cal/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(HN₂⁺ • 9 Nitrogen ) + = (HN₂⁺ • 10)

By formula: (HN₂⁺ • 9N₂) + N₂ = (HN₂⁺ • 10N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.8 ± 0.3	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.8	cal/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(HN₂⁺ • 10 Nitrogen ) + = (HN₂⁺ • 11)

By formula: (HN₂⁺ • 10N₂) + N₂ = (HN₂⁺ • 11N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.72	kcal/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	22.	cal/mol*K	N/A	Hiraoka and Mori, 1989	gas phase; Entropy change calculated or estimated; M

( • ) + Nitrogen = ( • • )

By formula: (H₃O⁺ • H₂O) + N₂ = (H₃O⁺ • N₂ • H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.3	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	13.9	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; M

( • 2) + Nitrogen = ( • • 2)

By formula: (H₃O⁺ • 2H₂O) + N₂ = (H₃O⁺ • N₂ • 2H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.0	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	14.3	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; M

( • Nitrogen • ) + = ( • 2 • )

By formula: (H₃O⁺ • N₂ • H₂O) + N₂ = (H₃O⁺ • 2N₂ • H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.9	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	13.1	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; M

( • Nitrogen • 2) + = ( • 2 • 2)

By formula: (H₃O⁺ • N₂ • 2H₂O) + N₂ = (H₃O⁺ • 2N₂ • 2H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.2	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.6	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; M

( • Nitrogen • 3) + = ( • 2 • 3)

By formula: (H₃O⁺ • N₂ • 3H₂O) + N₂ = (H₃O⁺ • 2N₂ • 3H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.4	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	15.7	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; M

( • 2 Nitrogen • ) + = ( • 3 • )

By formula: (H₃O⁺ • 2N₂ • H₂O) + N₂ = (H₃O⁺ • 3N₂ • H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8. ± 2.	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	22.	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; M

( • 2 Nitrogen • 2) + = ( • 3 • 2)

By formula: (H₃O⁺ • 2N₂ • 2H₂O) + N₂ = (H₃O⁺ • 3N₂ • 2H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.0 ± 2.7	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	28.4	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; M

( • 2 Nitrogen • 3) + = ( • 3 • 3)

By formula: (H₃O⁺ • 2N₂ • 3H₂O) + N₂ = (H₃O⁺ • 3N₂ • 3H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.2	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; Δ_rH, Δ_rS approximate; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	6.4	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; Δ_rH, Δ_rS approximate; M

( • 3 Nitrogen • 2) + = ( • 4 • 2)

By formula: (H₃O⁺ • 3N₂ • 2H₂O) + N₂ = (H₃O⁺ • 4N₂ • 2H₂O)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; Δ_rH, Δ_rS approximate; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	12.	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; Δ_rH, Δ_rS approximate; M

+ Nitrogen = ( • )

By formula: H₄N⁺ + N₂ = (H₄N⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	13. ± 5.	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	31.	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; M

+ Nitrogen = ( • )

By formula: K⁺ + N₂ = (K⁺ • N₂)

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
1.0	310.	DT	Beyer and Keller, 1971	gas phase; low E/N; M

+ Nitrogen = ( • )

By formula: Li⁺ + N₂ = (Li⁺ • N₂)

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
5.6	318.	DT	Gatland, Colonna-Romano, et al., 1975	gas phase; low E/N; M

( • Nitrogen ) + = ( • 2)

By formula: (Li⁺ • N₂) + N₂ = (Li⁺ • 2N₂)

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
4.4	318.	DT	Gatland, Colonna-Romano, et al., 1975	gas phase; low E/N; M

N⁺ + Nitrogen = (N⁺ • )

By formula: N⁺ + N₂ = (N⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	59.4	kcal/mol	N/A	National Bureau of Standards, 1968	gas phase; from Δ_rH(f); M
Δ_rH°	60.	kcal/mol	EI	Saporoschenko, 1965	gas phase; M
Δ_rH°	59.	kcal/mol	EI	Franklin, Dibeler, et al., 1958	gas phase; M

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
86.2 (+1.8,-0.)		CID	Haynes, Freysinger, et al., 1995	gas phase; guided ion beam CID; M

+ Nitrogen = ( • )

By formula: NO^- + N₂ = (NO^- • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.6 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Δ_rH°	4.7	kcal/mol	DT	Gheno and Fitaire, 1987	gas phase; Δ_rS+-2.9 cal/mol*K; M
Δ_rH°	4.4	kcal/mol	HPMS	Speller, Fitaire, et al., 1983	gas phase; Entropy change is questionable; M
Δ_rH°	5.2	kcal/mol	HPMS	Turner and Conway, 1976	gas phase; M
Δ_rH°	4.5	kcal/mol	DT	Johnsen, Huang, et al., 1975	gas phase; corrected for ln T by Keesee and Castleman, 1986; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.0	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Δ_rS°	13.8	cal/mol*K	DT	Gheno and Fitaire, 1987	gas phase; Δ_rS+-2.9 cal/mol*K; M
Δ_rS°	13.3	cal/mol*K	HPMS	Speller, Fitaire, et al., 1983	gas phase; Entropy change is questionable; M
Δ_rS°	18.9	cal/mol*K	HPMS	Turner and Conway, 1976	gas phase; M
Δ_rS°	15.7	cal/mol*K	DT	Johnsen, Huang, et al., 1975	gas phase; corrected for ln T by Keesee and Castleman, 1986; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.5	200.	FA	Dunkin, Fehsenfeld, et al., 1971	gas phase; M

( • Nitrogen ) + = ( • 2)

By formula: (NO^- • N₂) + N₂ = (NO^- • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.2 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Δ_rH°	3.9	kcal/mol	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.4	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Δ_rS°	12.6	cal/mol*K	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M

( • 2 Nitrogen ) + = ( • 3)

By formula: (NO^- • 2N₂) + N₂ = (NO^- • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.8 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.8	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.9	204.	HPMS	Speller, Fitaire, et al., 1983	gas phase; M

( • 3 Nitrogen ) + = ( • 4)

By formula: (NO^- • 3N₂) + N₂ = (NO^- • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.4 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.9	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.4	204.	HPMS	Speller, Fitaire, et al., 1983	gas phase; M

( • 4 Nitrogen ) + = ( • 5)

By formula: (NO^- • 4N₂) + N₂ = (NO^- • 5N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.2 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.3	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

( • 5 Nitrogen ) + = ( • 6)

By formula: (NO^- • 5N₂) + N₂ = (NO^- • 6N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.0 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	22.9	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

( • 6 Nitrogen ) + = ( • 7)

By formula: (NO^- • 6N₂) + N₂ = (NO^- • 7N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.8 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	22.8	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

( • 7 Nitrogen ) + = ( • 8)

By formula: (NO^- • 7N₂) + N₂ = (NO^- • 8N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.6 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	23.3	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

( • 8 Nitrogen ) + = ( • 9)

By formula: (NO^- • 8N₂) + N₂ = (NO^- • 9N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.9 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.5	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

( • 9 Nitrogen ) + = ( • 10)

By formula: (NO^- • 9N₂) + N₂ = (NO^- • 10N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.68	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.	cal/mol*K	N/A	Hiraoka and Yamabe, 1989	gas phase; Entropy change calculated or estimated; M

NO₂⁺ + Nitrogen = (NO₂⁺ • )

By formula: NO₂⁺ + N₂ = (NO₂⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.6 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.2	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

(NO₂⁺ • Nitrogen ) + = (NO₂⁺ • 2)

By formula: (NO₂⁺ • N₂) + N₂ = (NO₂⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.5 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.7	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

(NO₂⁺ • 2 Nitrogen ) + = (NO₂⁺ • 3)

By formula: (NO₂⁺ • 2N₂) + N₂ = (NO₂⁺ • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.4 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.9	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

(NO₂⁺ • 3 Nitrogen ) + = (NO₂⁺ • 4)

By formula: (NO₂⁺ • 3N₂) + N₂ = (NO₂⁺ • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.7 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.7	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

(NO₂⁺ • 4 Nitrogen ) + = (NO₂⁺ • 5)

By formula: (NO₂⁺ • 4N₂) + N₂ = (NO₂⁺ • 5N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.2 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	25.7	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

(NO₂⁺ • 5 Nitrogen ) + = (NO₂⁺ • 6)

By formula: (NO₂⁺ • 5N₂) + N₂ = (NO₂⁺ • 6N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.1 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.0	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

(NO₂⁺ • 6 Nitrogen ) + = (NO₂⁺ • 7)

By formula: (NO₂⁺ • 6N₂) + N₂ = (NO₂⁺ • 7N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.9 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.0	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

(NO₂⁺ • 7 Nitrogen ) + = (NO₂⁺ • 8)

By formula: (NO₂⁺ • 7N₂) + N₂ = (NO₂⁺ • 8N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.8 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.9	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

(NO₂⁺ • 8 Nitrogen ) + = (NO₂⁺ • 9)

By formula: (NO₂⁺ • 8N₂) + N₂ = (NO₂⁺ • 9N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.7 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.9	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

(NO₂⁺ • 9 Nitrogen ) + = (NO₂⁺ • 10)

By formula: (NO₂⁺ • 9N₂) + N₂ = (NO₂⁺ • 10N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.7 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.6	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

(NO₂⁺ • 10 Nitrogen ) + = (NO₂⁺ • 11)

By formula: (NO₂⁺ • 10N₂) + N₂ = (NO₂⁺ • 11N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.5 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.6	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

(NO₂⁺ • 11 Nitrogen ) + = (NO₂⁺ • 12)

By formula: (NO₂⁺ • 11N₂) + N₂ = (NO₂⁺ • 12N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.5 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.6	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989	gas phase; M

+ Nitrogen = ( • )

By formula: N₂⁺ + N₂ = (N₂⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	24.4 to 24.4	kcal/mol	RNG	N/A	Range of 6 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.0	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rS°	16.2	cal/mol*K	PHPMS	Teng and Conway, 1973	gas phase; M
Δ_rS°	19.5	cal/mol*K	PHPMS	Payzant and Kebarle, 1970	gas phase; M
Δ_rS°	11.	cal/mol*K	DT	Varney, 1968	gas phase; Entropy change is questionable; M
Δ_rS°	-1.	cal/mol*K	DT	Varney, 1959	gas phase; Entropy change is questionable; M

( • Nitrogen ) + = ( • 2)

By formula: (N₂⁺ • N₂) + N₂ = (N₂⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.8 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rH°	1.4	kcal/mol	PI	Linn, Ono, et al., 1981	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	15.0	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 2 Nitrogen ) + = ( • 3)

By formula: (N₂⁺ • 2N₂) + N₂ = (N₂⁺ • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.7 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	15.8	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 3 Nitrogen ) + = ( • 4)

By formula: (N₂⁺ • 3N₂) + N₂ = (N₂⁺ • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.5 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.6	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 4 Nitrogen ) + = ( • 5)

By formula: (N₂⁺ • 4N₂) + N₂ = (N₂⁺ • 5N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.5 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.5	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 5 Nitrogen ) + = ( • 6)

By formula: (N₂⁺ • 5N₂) + N₂ = (N₂⁺ • 6N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.3 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.7	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 6 Nitrogen ) + = ( • 7)

By formula: (N₂⁺ • 6N₂) + N₂ = (N₂⁺ • 7N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.0 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.4	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 7 Nitrogen ) + = ( • 8)

By formula: (N₂⁺ • 7N₂) + N₂ = (N₂⁺ • 8N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.9 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.3	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 8 Nitrogen ) + = ( • 9)

By formula: (N₂⁺ • 8N₂) + N₂ = (N₂⁺ • 9N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.8 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.5	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 9 Nitrogen ) + = ( • 10)

By formula: (N₂⁺ • 9N₂) + N₂ = (N₂⁺ • 10N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.8 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.7	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 10 Nitrogen ) + = ( • 11)

By formula: (N₂⁺ • 10N₂) + N₂ = (N₂⁺ • 11N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.7 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.2	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

N₃⁺ + Nitrogen = (N₃⁺ • )

By formula: N₃⁺ + N₂ = (N₃⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.5 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.0	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M

(N₃⁺ • Nitrogen ) + = (N₃⁺ • 2)

By formula: (N₃⁺ • N₂) + N₂ = (N₃⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.1 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.2	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M

(N₃⁺ • 2 Nitrogen ) + = (N₃⁺ • 3)

By formula: (N₃⁺ • 2N₂) + N₂ = (N₃⁺ • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.1 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.4	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M

(N₃⁺ • 3 Nitrogen ) + = (N₃⁺ • 4)

By formula: (N₃⁺ • 3N₂) + N₂ = (N₃⁺ • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.7 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	23.2	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M

(N₃⁺ • 4 Nitrogen ) + = (N₃⁺ • 5)

By formula: (N₃⁺ • 4N₂) + N₂ = (N₃⁺ • 5N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	3.3 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	25.3	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M

(N₃⁺ • 5 Nitrogen ) + = (N₃⁺ • 6)

By formula: (N₃⁺ • 5N₂) + N₂ = (N₃⁺ • 6N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.4 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	21.2	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M

(N₃⁺ • 6 Nitrogen ) + = (N₃⁺ • 7)

By formula: (N₃⁺ • 6N₂) + N₂ = (N₃⁺ • 7N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.1 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.3	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M

(N₃⁺ • 7 Nitrogen ) + = (N₃⁺ • 8)

By formula: (N₃⁺ • 7N₂) + N₂ = (N₃⁺ • 8N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.8 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.7	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M

(N₃⁺ • 8 Nitrogen ) + = (N₃⁺ • 9)

By formula: (N₃⁺ • 8N₂) + N₂ = (N₃⁺ • 9N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.6 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.3	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M

(N₃⁺ • 9 Nitrogen ) + = (N₃⁺ • 10)

By formula: (N₃⁺ • 9N₂) + N₂ = (N₃⁺ • 10N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.5 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.5	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M

(N₃⁺ • 10 Nitrogen ) + = (N₃⁺ • 11)

By formula: (N₃⁺ • 10N₂) + N₂ = (N₃⁺ • 11N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.4 ± 0.3	kcal/mol	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.9	cal/mol*K	PHPMS	Hiraoka and Yamabe, 1989, 2	gas phase; M

+ Nitrogen = ( • )

By formula: Na⁺ + N₂ = (Na⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.0	kcal/mol	FA	Perry, Rowe, et al., 1980	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.6	cal/mol*K	FA	Perry, Rowe, et al., 1980	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
2.2	310.	FA	Perry, Rowe, et al., 1980	gas phase; M
2.0	310.	DT	Beyer and Keller, 1971	gas phase; low E/N; M

( • Nitrogen ) + = ( • 2)

By formula: (Na⁺ • N₂) + N₂ = (Na⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.3	kcal/mol	FA	Perry, Rowe, et al., 1980	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.8	cal/mol*K	FA	Perry, Rowe, et al., 1980	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
-0.3	310.	FA	Perry, Rowe, et al., 1980	gas phase; M

+ Nitrogen = ( • )

By formula: Ni⁺ + N₂ = (Ni⁺ • N₂)

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
26.5 (+2.5,-0.)		CID	Khan, Steele, et al., 1995	gas phase; guided ion beam CID; M

( • Nitrogen ) + = ( • 2)

By formula: (Ni⁺ • N₂) + N₂ = (Ni⁺ • 2N₂)

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
26.5 (+2.5,-0.)		CID	Khan, Steele, et al., 1995	gas phase; guided ion beam CID; M

( • 2 Nitrogen ) + = ( • 3)

By formula: (Ni⁺ • 2N₂) + N₂ = (Ni⁺ • 3N₂)

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
13.4 (+0.9,-0.)		CID	Khan, Steele, et al., 1995	gas phase; guided ion beam CID; M

( • 3 Nitrogen ) + = ( • 4)

By formula: (Ni⁺ • 3N₂) + N₂ = (Ni⁺ • 4N₂)

Enthalpy of reaction

Δ_rH° (kcal/mol)	T (K)	Method	Reference	Comment
10.1 (+2.3,-0.)		CID	Khan, Steele, et al., 1995	gas phase; guided ion beam CID; M

+ Nitrogen = ( • )

By formula: O₂⁺ + N₂ = (O₂⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	5.0 ± 0.3	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rH°	5.2	kcal/mol	HPMS	Speller and Fitaire, 1983	gas phase; M
Δ_rH°	5.7	kcal/mol	PHPMS	Janik and Conway, 1967	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.4	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rS°	15.8	cal/mol*K	HPMS	Speller and Fitaire, 1983	gas phase; M
Δ_rS°	18.9	cal/mol*K	PHPMS	Janik and Conway, 1967	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.0	296.	FA	Howard, Bierbaum, et al., 1972	gas phase; M

( • Nitrogen ) + = ( • 2)

By formula: (O₂⁺ • N₂) + N₂ = (O₂⁺ • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.5 ± 0.3	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rH°	4.3	kcal/mol	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.1	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rS°	13.8	cal/mol*K	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M

( • 2 Nitrogen ) + = ( • 3)

By formula: (O₂⁺ • 2N₂) + N₂ = (O₂⁺ • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.2 ± 0.3	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rH°	3.5	kcal/mol	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.6	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Δ_rS°	12.1	cal/mol*K	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M

( • 3 Nitrogen ) + = ( • 4)

By formula: (O₂⁺ • 3N₂) + N₂ = (O₂⁺ • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	4.0 ± 0.3	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	22.5	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.7	204.	HPMS	Speller and Fitaire, 1983	gas phase; M

( • 4 Nitrogen ) + = ( • 5)

By formula: (O₂⁺ • 4N₂) + N₂ = (O₂⁺ • 5N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.7 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.2	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.7	184.	HPMS	Speller and Fitaire, 1983	gas phase; M

( • 5 Nitrogen ) + = ( • 6)

By formula: (O₂⁺ • 5N₂) + N₂ = (O₂⁺ • 6N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.5 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.1	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 6 Nitrogen ) + = ( • 7)

By formula: (O₂⁺ • 6N₂) + N₂ = (O₂⁺ • 7N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.3 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.5	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 7 Nitrogen ) + = ( • 8)

By formula: (O₂⁺ • 7N₂) + N₂ = (O₂⁺ • 8N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.1 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.3	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 8 Nitrogen ) + = ( • 9)

By formula: (O₂⁺ • 8N₂) + N₂ = (O₂⁺ • 9N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.9 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.1	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 9 Nitrogen ) + = ( • 10)

By formula: (O₂⁺ • 9N₂) + N₂ = (O₂⁺ • 10N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.7 ± 0.2	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.8	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • 10 Nitrogen ) + = ( • 11)

By formula: (O₂⁺ • 10N₂) + N₂ = (O₂⁺ • 11N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.4 ± 0.3	kcal/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.2	cal/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase; M

( • Nitrogen • ) + = ( • 2 • )

By formula: (O₂⁺ • N₂ • O₂) + N₂ = (O₂⁺ • 2N₂ • O₂)

Free energy of reaction

Δ_rG° (kcal/mol)	T (K)	Method	Reference	Comment
0.5	230.	HPMS	Speller and Fitaire, 1983	gas phase; M

( • ) + Nitrogen = ( • • )

By formula: (O₂⁺ • O₂) + N₂ = (O₂⁺ • N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.9	kcal/mol	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	10.1	cal/mol*K	HPMS	Speller and Fitaire, 1983	gas phase; Entropy change is questionable; M

+ Nitrogen = ( • )

By formula: O₂^- + N₂ = (O₂^- • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.0 ± 1.0	kcal/mol	N/A	Posey and Johnson, 1988	gas phase; B
Δ_rH°	<13.60	kcal/mol	IMRB	Adams and Bohme, 1970	gas phase; N₂..O₂^- + O₂ -> O₄^-; B

( • Nitrogen • ) + = ( • 2 • )

By formula: (O₂^- • N₂ • O₂) + N₂ = (O₂^- • 2N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.8 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.9	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

( • 2 Nitrogen • ) + = ( • 3 • )

By formula: (O₂^- • 2N₂ • O₂) + N₂ = (O₂^- • 3N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.5 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.3	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

( • 3 Nitrogen • ) + = ( • 4 • )

By formula: (O₂^- • 3N₂ • O₂) + N₂ = (O₂^- • 4N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.2 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.7	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

( • 4 Nitrogen • ) + = ( • 5 • )

By formula: (O₂^- • 4N₂ • O₂) + N₂ = (O₂^- • 5N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.9 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.5	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

( • 5 Nitrogen • ) + = ( • 6 • )

By formula: (O₂^- • 5N₂ • O₂) + N₂ = (O₂^- • 6N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.8 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.5	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

( • 6 Nitrogen • ) + = ( • 7 • )

By formula: (O₂^- • 6N₂ • O₂) + N₂ = (O₂^- • 7N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.7 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.8	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

( • 7 Nitrogen • ) + = ( • 8 • )

By formula: (O₂^- • 7N₂ • O₂) + N₂ = (O₂^- • 8N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.6 ± 0.3	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Δ_rH°	1.53	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.9	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M
Δ_rS°	18.0	cal/mol*K	N/A	Hiraoka, 1988	gas phase; Entropy change calculated or estimated; M

( • ) + Nitrogen = ( • • )

By formula: (O₂^- • O₂) + N₂ = (O₂^- • N₂ • O₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.9 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.5	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

O₃^- + Nitrogen = (O₃^- • )

By formula: O₃^- + N₂ = (O₃^- • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.70 ± 0.20	kcal/mol	TDAs	Hiraoka, 1988	gas phase; B,M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.4	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-2.80 ± 0.50	kcal/mol	TDAs	Hiraoka, 1988	gas phase; B

(O₃^- • Nitrogen ) + = (O₃^- • 2)

By formula: (O₃^- • N₂) + N₂ = (O₃^- • 2N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.6 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.6	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

(O₃^- • 2 Nitrogen ) + = (O₃^- • 3)

By formula: (O₃^- • 2N₂) + N₂ = (O₃^- • 3N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.5 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.7	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

(O₃^- • 3 Nitrogen ) + = (O₃^- • 4)

By formula: (O₃^- • 3N₂) + N₂ = (O₃^- • 4N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.3 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	20.2	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

(O₃^- • 4 Nitrogen ) + = (O₃^- • 5)

By formula: (O₃^- • 4N₂) + N₂ = (O₃^- • 5N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.1 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.7	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

(O₃^- • 5 Nitrogen ) + = (O₃^- • 6)

By formula: (O₃^- • 5N₂) + N₂ = (O₃^- • 6N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.0 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	19.0	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

(O₃^- • 6 Nitrogen ) + = (O₃^- • 7)

By formula: (O₃^- • 6N₂) + N₂ = (O₃^- • 7N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.8 ± 0.2	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	18.2	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

(O₃^- • 7 Nitrogen ) + = (O₃^- • 8)

By formula: (O₃^- • 7N₂) + N₂ = (O₃^- • 8N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.7 ± 0.3	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	17.5	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

(O₃^- • 8 Nitrogen ) + = (O₃^- • 9)

By formula: (O₃^- • 8N₂) + N₂ = (O₃^- • 9N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1.5 ± 0.4	kcal/mol	PHPMS	Hiraoka, 1988	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	16.9	cal/mol*K	PHPMS	Hiraoka, 1988	gas phase; M

O₄^- + Nitrogen + = N₂O₄^-

By formula: O₄^- + N₂ + O₂ = N₂O₄^-

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.90 ± 0.20	kcal/mol	TDAs	Hiraoka, 1988	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	-2.10 ± 0.50	kcal/mol	TDAs	Hiraoka, 1988	gas phase; B

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Notes

Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A., CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Hiraoka and Yamabe, 1989
Hiraoka, K.; Yamabe, S., How are Nitrogen Molecules Bound to NO2+ and NO+?, J. Chem. Phys., 1989, 90, 6, 3268, https://doi.org/10.1063/1.455880 . [all data]

Gheno and Fitaire, 1987
Gheno, F.; Fitaire, M., Association of N2 with NH4+ and H3O+(H2O)n, n = 1,2,3, J. Chem. Phys., 1987, 87, 2, 953, https://doi.org/10.1063/1.453250 . [all data]

Speller, Fitaire, et al., 1983
Speller, C.V.; Fitaire, M.; Pointu, A.M., Three - Body Association Reactions of NO+ and O2+ with N2, J. Chem. Phys., 1983, 79, 5, 2190, https://doi.org/10.1063/1.446067 . [all data]

Turner and Conway, 1976
Turner, D.L.; Conway, D.C., Stability of the NO+.N2 Ion Cluster, J. Chem. Phys., 1976, 65, 10, 3944, https://doi.org/10.1063/1.432887 . [all data]

Johnsen, Huang, et al., 1975
Johnsen, R.; Huang, C.M.; Biondi, M.A., The Formation and Breakup of NO2+.N2 Clusters in N2 at Low Temperatures, J. Chem. Phys., 1975, 63, 8, 3374, https://doi.org/10.1063/1.431751 . [all data]

Keesee and Castleman, 1986
Keesee, R.G.; Castleman, A.W., Jr., Thermochemical data on Ggs-phase ion-molecule association and clustering reactions, J. Phys. Chem. Ref. Data, 1986, 15, 1011. [all data]

Dunkin, Fehsenfeld, et al., 1971
Dunkin, D.B.; Fehsenfeld, F.C.; Schelmetekopf, A.L.; Ferguson, E.E., Three-Body Association Reactions of NO+ with O2, N2, and CO2, J. Chem. Phys., 1971, 54, 9, 3817, https://doi.org/10.1063/1.1675432 . [all data]

Hiraoka and Nakajima, 1988
Hiraoka, K.; Nakajima, G., A Determination of the Stabilities of N2+(N2)n and O2+(N2)n with n = 1 - 11 from Measurements of the Gas - Phase Ion Equilibria, J. Chem. Phys., 1988, 88, 12, 7709, https://doi.org/10.1063/1.454285 . [all data]

Teng and Conway, 1973
Teng, H.H.; Conway, D.C., Ion - Molecule Equilibria in Mixtures of N2 and Ar, J. Chem. Phys., 1973, 59, 5, 2316, https://doi.org/10.1063/1.1680338 . [all data]

Payzant and Kebarle, 1970
Payzant, J.D.; Kebarle, P., Clustering Equilibrium N2+ + 2N2 = N4+ + N2 and the Bond Dissociation Energy of N4+, J. Chem. Phys., 1970, 53, 12, 4723, https://doi.org/10.1063/1.1674010 . [all data]

Varney, 1968
Varney, R.N., Equilibrium Constant and Rates for the Reversible Reaction N4+ -> N2+ + N2, Phys. Rev., 1968, 174, 1, 165, https://doi.org/10.1103/PhysRev.174.165 . [all data]

Varney, 1959
Varney, R.N., Molecular Ions, J. Chem. Phys., 1959, 31, 5, 1314, https://doi.org/10.1063/1.1730590 . [all data]

Speller and Fitaire, 1983
Speller, C.V.; Fitaire, M., Proceedings of the 16th International Conference on Phenomena of Ionized Gases, H. Boetticher, H. Wenk and E. Shulz - Gulde, ed(s)., ICPIG, Dusseldorf, 1983, 568. [all data]

Janik and Conway, 1967
Janik, G.S.; Conway, D.C., Bonding in Heteromolecular Ion Clusters. N2O2+, J. Phys. Chem., 1967, 71, 4, 823, https://doi.org/10.1021/j100863a007 . [all data]

Howard, Bierbaum, et al., 1972
Howard, C.J.; Bierbaum, V.M.; Rundle, H.W.; Kaufman, F., Kinetics and Mechanism of Formation of Water Cluster Ions from O2+ and H2O+, J. Chem. Phys., 1972, 57, 8, 3491, https://doi.org/10.1063/1.1678783 . [all data]

Hiraoka and Mori, 1989
Hiraoka, K.; Mori, T., Gas Phase Stabilities of the Cluster Ions H+(CO)2(CO)n, H+(N2)2(N2)n and H+(O2)2(O2)n with n = 1 - 14, Chem. Phys., 1989, 137, 1-3, 345, https://doi.org/10.1016/0301-0104(89)87119-8 . [all data]

Hiraoka, Saluja, et al., 1979
Hiraoka, K.; Saluja, P.P.S.; Kebarle, P., Stabilities of Complexes (N2)nH+, (CO)nH+ and (O2)nH+ for n = 1 to 7 Based on Gas Phase Ion Equilibrium Measurements, Can. J. Chem., 1979, 57, 16, 2159, https://doi.org/10.1139/v79-346 . [all data]

Hiraoka, 1988
Hiraoka, K., Determination of the Stabilities of O₃^-(N₂)n, O₃^-(O₂)n, and O₄^-(N₂)n from Measurements of the Gas Phase Equilibria, Chem. Phys., 1988, 125, 2-3, 439, https://doi.org/10.1016/0301-0104(88)87096-4 . [all data]

Turner, Simpson, et al., 1983
Turner, J.J.; Simpson, M.B.; Poliakoff, M.; Maier II, W.B., J. Am. Chem. Soc., 1983, 105, 3898. [all data]

National Bureau of Standards, 1968
National Bureau of Standards, US, Technical Note 270 - 3 in The NBS Tables of Chemical Thermodynamic Properties, 1968. [all data]

Saporoschenko, 1965
Saporoschenko, M., Mobility of Mass Analyzed N+, N2+, N3+, and N4+ Ions in Nitrogen Gas, Phys. Rev. A, 1965, 139, 352. [all data]

Franklin, Dibeler, et al., 1958
Franklin, J.L.; Dibeler, V.H.; Reese, R.M.; Krauss, M., Ionization and dissociation of hydrazoic acid and methyl azide by electron impact, J. Am. Chem. Soc., 1958, 80, 298. [all data]

Haynes, Freysinger, et al., 1995
Haynes, C.L.; Freysinger, W.; Armentrout, P.B., Collision-induced dissociation of N₃⁺(X³-) with Ne, Ar, Kr, and Xe, Int. J. Mass Spectrom. Ion Processes, 1995, 149/150, 267. [all data]

El-Shall, Schriver, et al., 1989
El-Shall, M.S.; Schriver, K.E.; Whetten, R.L.; Meot-Ner (Mautner), M., Ion/Molecule Clustering Thermochemistry by Laser Ionization High - Pressure Mass Spectrometry, J. Phys. Chem., 1989, 93, 24, 7969, https://doi.org/10.1021/j100361a002 . [all data]

Perry, Rowe, et al., 1980
Perry, R.A.; Rowe, B.R.; Viggiano, A.A.; Albritton, D.L.; Ferguson, E.E.; Fehsenfeld, F.C., Laboratory Measurements of Stratospheric Sodium Ion Measurements, Geophys. Res. Lett., 1980, 7, 9, 693, https://doi.org/10.1029/GL007i009p00693 . [all data]

Beyer and Keller, 1971
Beyer, R.A.; Keller, G.E., The Clustering of Atmospheric Gases to Alkali Ions, Trans. Am. Geophys. Union, 1971, 52, 303. [all data]

Meot-Ner (Mautner) and Field, 1974
Meot-Ner (Mautner), M.; Field, F.H., Kinetics and Thermodynamics of the Association of CO+ with CO and of N2+ with N2 between 120 and 650 K, J. Chem. Phys., 1974, 61, 9, 3742, https://doi.org/10.1063/1.1682560 . [all data]

Gonzalez and Hoff, 1989
Gonzalez, A.A.; Hoff, C.D., Inorg. Chem., 1989, 28, 4295. [all data]

Speller, 1983
Speller, C.V., Ph. D. Thesis, Universite de Paris Sud, 1983. [all data]

Linn, Ono, et al., 1981
Linn, S.H.; Ono, Y.; Ng, C.Y., Molecular Beam Photoionization Study of CO, N2, and NO Dimers and Clusters, J. Chem. Phys., 1981, 74, 6, 3342, https://doi.org/10.1063/1.441486 . [all data]

Speller, Fitaire, et al., 1982
Speller, C.V.; Fitaire, M.; Pointu, A.M., H2CN+.nN2 Clustering Formation and the Atmosphere of Titan, Nature, 1982, 300, 5892, 507, https://doi.org/10.1038/300507a0 . [all data]

Howard and Skinner, 1966
Howard, P.B.; Skinner, H.A., Thermochemistry of some reactions of aqueous hydrazine with halogens, hydrogen halides and N-halogenosuccinimides, J. Chem. Soc. A, 1966, 1536-1540. [all data]

Pedley, Naylor, et al., 1986
Pedley, J.B.; Naylor, R.D.; Kirby, S.P., Thermochemical Data of Organic Compounds, Chapman and Hall, New York, 1986, 1-792. [all data]

Posey and Johnson, 1988
Posey, L.A.; Johnson, M.A., Pulsed Photoelectron Spectroscopy of Negative Cluster Ions: Isolation of Three Distinguishable Forms of N₂O₂^-, J. Chem. Phys., 1988, 88, 9, 5385, https://doi.org/10.1063/1.454576 . [all data]

Adams and Bohme, 1970
Adams, N.G.; Bohme, D., Flowing Afterglow Studies of Formation and Reactions of Cluster Ions of O₂⁺, O₂^-, and O^-, J. Chem. Phys., 1970, 52, 6, 3133, https://doi.org/10.1063/1.1673449 . [all data]

Belt, Scaiano, et al., 1993
Belt, S.T.; Scaiano, J.C.; Whittlesey, M.K., J. Am. Chem. Soc., 1993, 115, 1921. [all data]

Johnson, Popov, et al., 1991
Johnson, F.P.A.; Popov, V.K.; George, M.W.; Bagratashvili, V.N.; Poliakoff, M.; Turner, J.J., Mendeleev Commun., 1991, 145.. [all data]

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Trickl, Cromwell, et al., 1989
Trickl, T.; Cromwell, E.F.; Lee, Y.T.; Kung, A.H., State-selective ionization of nitrogen in the X₂ =0 and v =1 states by two-color (1+1) photon excitation near threshold, J. Chem. Phys., 1989, 91, 6006. [all data]

Stephen, Mark, et al., 1984
Stephen, K.; Mark, T.D.; Futrell, J.H.; Helm, H., Electron impact ionization of (N₂)₂: Appearance energies of N₃⁺ and N₄⁺, J. Chem. Phys., 1984, 80, 3185. [all data]

Grade, Wienecke, et al., 1983
Grade, M.; Wienecke, J.; Rosinger, W.; Hirschwald, W., Electron impact investigation of the molecules SeS(g) and TeSe(g) under high-temperature equilibrium conditions, Ber. Bunsen-Ges. Phys. Chem., 1983, 87, 355. [all data]

Kimura, Katsumata, et al., 1981
Kimura, K.; Katsumata, S.; Achiba, Y.; Yamazaki, T.; Iwata, S., Ionization energies, Ab initio assignments, and valence electronic structure for 200 molecules in Handbook of HeI Photoelectron Spectra of Fundamental Organic Compounds, Japan Scientific Soc. Press, Tokyo, 1981. [all data]

Armentrout, Tarr, et al., 1981
Armentrout, P.B.; Tarr, S.M.; Dori, A.; Freund, R.S., Electron impact ionization cross section of metastable N₂ (A₂Σu⁺), J. Chem. Phys., 1981, 75, 2788. [all data]

Huber and Herzberg, 1979
Huber, K.P.; Herzberg, G., Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules,, Van Nostrand Reinhold Co., 1979, ,1. [all data]

Sahini, Constantin, et al., 1978
Sahini, V.E.; Constantin, V.; Serban, I., Determination of ionization potentials using a MI-1305 mass spectrometer, Rev. Roum. Chim., 1978, 23, 479. [all data]

Rabalais, Debies, et al., 1974
Rabalais, J.W.; Debies, T.P.; Berkosky, J.L.; Huang, J.-T.J.; Ellison, F.O., Calculated photoionization cross sections relative experimental photoionization intensities for a selection of small molecules, J. Chem. Phys., 1974, 61, 516. [all data]

Lee and Rabalais, 1974
Lee, T.H.; Rabalais, J.W., Vibrational transition probabilities in photoelectron spectra, J. Chem. Phys., 1974, 61, 2747. [all data]

Natalis, 1973
Natalis, P., Contribution a la spectroscopie photoelectronique. Effets de l'autoionisation dans less spectres photoelectroniques de molecules diatomiques et triatomiques, Acad. R. Belg. Mem. Cl. Sci. Collect. 8, 1973, 41, 1. [all data]

Hotop and Niehaus, 1970
Hotop, H.; Niehaus, A., Reactions of excited atoms and molecules with atoms and molecules. V.Comparison of Penning electron and photoelectron spectra of H₂, N₂ and CO, Intern. J. Mass Spectrom. Ion Phys., 1970, 5, 415. [all data]

Cermak, 1968
Cermak, V., Penning ionization electron spectroscopy. I. Determination of ionization potentials of polyatomic molecules, Collection Czech. Chem. Commun., 1968, 33, 2739. [all data]

Cook and Metzger, 1964
Cook, G.R.; Metzger, P.H., Photoionization and absorption cross sections of O₂ and N₂ in the 600- to 1000-A region, J. Chem. Phys., 1964, 41, 321. [all data]

Ogawa and Tanaka, 1962
Ogawa, M.; Tanaka, Y., Rydberg absorption series of N₂, Can. J. Phys., 1962, 40, 1593. [all data]

Worley, 1943
Worley, R.E., Absorption spectrum of N₂ in the extreme ultraviolet, Phys. Rev., 1943, 64, 207. [all data]

Worley and Jenkins, 1938
Worley, R.E.; Jenkins, F.A., A new Rydberg series in N₂, Phys. Rev., 1938, 54, 305. [all data]

Potts and Williams, 1974
Potts, A.W.; Williams, T.A., The observation of "forbidden" transitions in He II photoelectron spectra, J. Electron Spectrosc. Relat. Phenom., 1974, 3, 3. [all data]

Katrib, Debies, et al., 1973
Katrib, A.; Debies, T.P.; Colton, R.J.; Lee, T.H.; Rabalais, J.W., The use of differential photoionization cross sections as a function of excitation energy in assigning photoelectron spectra, Chem. Phys. Lett., 1973, 22, 196. [all data]

Locht, Schopman, et al., 1975
Locht, R.; Schopman, J.; Wankenne, H.; Momigny, J., The dissociative ionization of nitrogen, Chem. Phys., 1975, 7, 393. [all data]

Smyth, Schiavone, et al., 1973
Smyth, K.C.; Schiavone, J.A.; Freund, R.S., Dissociative excitation of N₂ by electron impact: Translational spectroscopy of long-lived high- Rydberg fragment atoms, J. Chem. Phys., 1973, 59, 5225. [all data]

Crowe and McConkey, 1973
Crowe, A.; McConkey, J.W., Dissociative ionization by electron impact II. N⁺ N⁺⁺ from N₂, J. Phys. B:, 1973, 6, 2108. [all data]

Hierl and Franklin, 1967
Hierl, P.M.; Franklin, J.L., Appearance potentials and kinetic energies of ions from N₂, CO, and NO, J. Chem. Phys., 1967, 47, 3154. [all data]

Frost and McDowell, 1956
Frost, D.C.; McDowell, C.A., The dissociation energy of the nitrogen molecule, Proc. Roy. Soc. (London), 1956, A236, 278. [all data]

Shul, Passarella, et al., 1987
Shul, R.J.; Passarella, R.; Upshulte, B.L.; Keesee, R.G.; Castleman, A.W., Thermal Energy Reactions Invoving Ar+ Monomer and Dimer with N2, H2, Xe, and Kr, J. Chem. Phys., 1987, 86, 8, 4446, https://doi.org/10.1063/1.452718 . [all data]

Dehmer and Pratt, 1982
Dehmer, P.M.; Pratt, S.T., Photoionization of ArKr, ArXe, and KrXe and bond dissociation energies of the rare gas dimer ions, J. Chem. Phys., 1982, 77, 4804. [all data]

Hiraoka, Nasu, et al., 1996
Hiraoka, K.; Nasu, M.; Fujimaki, S.; Ignacio, E.W.; Yamabe, S., Gas-Phase Stability and Structure of the Cluster Ions CF3+(CO)n, CF3+(N2)n, CF3+((CF4)n, and CF4H+(CF4)n, J. Phys. Chem., 1996, 100, 13, 5245, https://doi.org/10.1021/jp9530010 . [all data]

Foster, Williamson, et al., 1974
Foster, M.S.; Williamson, A.D.; Beauchamp, J.L., Photoionization mass spectrometry of trans-azomethane, Int. J. Mass Spectrom. Ion Phys., 1974, 15, 429. [all data]

Spears and Fehsenfeld, 1972
Spears, K.G.; Fehsenfeld, F.C., Termolecular Association Reactions of Mg, Ca, and Ba Ions, J. Chem. Phys., 1972, 56, 11, 5698, https://doi.org/10.1063/1.1677091 . [all data]

Rodgers and Armentrout, 2000
Rodgers, M.T.; Armentrout, P.B., Noncovalent Metal-Ligand Bond Energies as Studied by Threshold Collision-Induced Dissociation, Mass Spectrom. Rev., 2000, 19, 4, 215, https://doi.org/10.1002/1098-2787(200007)19:4<215::AID-MAS2>3.0.CO;2-X . [all data]

Gatland, Colonna-Romano, et al., 1975
Gatland, I.R.; Colonna-Romano, L.M.; Keller, G.E., Single and Double Clustering of Nitrogen to Li+, Phys. Rev. A, 1975, 12, 5, 1885, https://doi.org/10.1103/PhysRevA.12.1885 . [all data]

Hiraoka and Yamabe, 1989, 2
Hiraoka, K.; Yamabe, S., Stabilities of the N3+(N2)n Cluster Ions with n = 1 - 11, Chem. Phys. Lett., 1989, 154, 2, 139, https://doi.org/10.1016/S0009-2614(89)87275-6 . [all data]

Khan, Steele, et al., 1995
Khan, F.A.; Steele, D.L.; Armentrout, P.B., Ligand effects in organometallic thermochemistry: The sequential bond energies of Ni(CO)_x⁺ and Ni(N₂)_x⁺ (x = 1-4) and Ni(NO)_x⁺ (x = 1-3) [Data derived from reported bond energies taking value of 8.273±0.046 eV for IE[Ni(CO)₄]], J. Phys. Chem., 1995, 99, 7819. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, References

Symbols used in this document:

AE	Appearance energy
IE (evaluated)	Recommended ionization energy
S°_{gas,1 bar}	Entropy of gas at standard conditions (1 bar)
T	Temperature
Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions
Δ_rS°	Entropy of reaction at standard conditions

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
Customer support for NIST Standard Reference Data products.