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:
- Reaction thermochemistry data: reactions 1 to 50, 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
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Gas phase thermochemistry data

Go To: Top, Phase change 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.

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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

Phase change data

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

Data compiled as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos

Quantity	Value	Units	Method	Reference	Comment
T_boil	77.34	K	N/A	Jacobsen, Stewart, et al., 1986	TRC
T_boil	77.4	K	N/A	Streng, 1971	Uncertainty assigned by TRC = 0.3 K; TRC
Quantity	Value	Units	Method	Reference	Comment
T_fus	63.3	K	N/A	Streng, 1971	Uncertainty assigned by TRC = 0.3 K; TRC
Quantity	Value	Units	Method	Reference	Comment
T_triple	63.14	K	N/A	Jacobsen, Stewart, et al., 1986	TRC
T_triple	63.14	K	N/A	Angus, de Reuck, et al., 1979	Uncertainty assigned by TRC = 0.005 K; TRC
T_triple	63.14	K	N/A	Henning and Otto, 1936	Uncertainty assigned by TRC = 0.06 K; temperature measured with He gas thermometer; TRC
T_triple	63.13	K	N/A	Giauque and Clayton, 1933	Crystal phase 1 phase; Uncertainty assigned by TRC = 0.06 K; TRC
Quantity	Value	Units	Method	Reference	Comment
P_triple	0.1236	atm	N/A	Jacobsen, Stewart, et al., 1986	Uncertainty assigned by TRC = 0.0005 atm; TRC
P_triple	0.1237	atm	N/A	Angus, de Reuck, et al., 1979	Uncertainty assigned by TRC = 0.0002 atm; TRC
P_triple	0.124	atm	N/A	Henning and Otto, 1936	Uncertainty assigned by TRC = 0.0007 atm; TRC
P_triple	0.1237	atm	N/A	Giauque and Clayton, 1933	Crystal phase 1 phase; Uncertainty assigned by TRC = 0.0001 atm; Average Pressure; TRC
Quantity	Value	Units	Method	Reference	Comment
T_c	126.19	K	N/A	Jacobsen, Stewart, et al., 1986	Uncertainty assigned by TRC = 0.01 K; TRC
T_c	126.2	K	N/A	Angus, de Reuck, et al., 1979	Uncertainty assigned by TRC = 0.05 K; TRC
T_c	126.2	K	N/A	Weber, 1970	Uncertainty assigned by TRC = 0.2 K; IPTS-68, critical point not observed and Tc taken from literature but equation would allow pc to be calculated. Tc unct. several tenths K. "Ultra-high" purity nitrogen.; TRC
T_c	128.45	K	N/A	Cardoso, 1915	Uncertainty assigned by TRC = 0.5 K; TRC
Quantity	Value	Units	Method	Reference	Comment
P_c	33.534	atm	N/A	Jacobsen, Stewart, et al., 1986	Uncertainty assigned by TRC = 0.007 atm; TRC
P_c	33.56	atm	N/A	Angus, de Reuck, et al., 1979	Uncertainty assigned by TRC = 0.05 atm; TRC
P_c	3.0297	atm	N/A	Cardoso, 1915	Uncertainty assigned by TRC = 0.003 atm; TRC
P_c	3.0281	atm	N/A	Cardoso, 1915	Uncertainty assigned by TRC = 0.003 atm; TRC
Quantity	Value	Units	Method	Reference	Comment
ρ_c	11.18	mol/l	N/A	Jacobsen, Stewart, et al., 1986	Uncertainty assigned by TRC = 0.02 mol/l; TRC
ρ_c	11.2	mol/l	N/A	Angus, de Reuck, et al., 1979	Uncertainty assigned by TRC = 0.02 mol/l; TRC

Enthalpy of vaporization

Δ_vapH (kcal/mol)	Temperature (K)	Reference	Comment
1.5	78.	Edejer and Thodos, 1967	Based on data from 63. to 126. K.; AC
1.3	77.	Giauque and Clayton, 1933, 2	AC

Antoine Equation Parameters

log₁₀(P) = A − (B / (T + C))
P = vapor pressure (atm)
T = temperature (K)

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Temperature (K)	A	B	C	Reference	Comment
63.14 to 126.	3.7305	264.651	-6.788	Edejer and Thodos, 1967	Coefficents calculated by NIST from author's data.
63.14 to 78.00	3.63221	257.877	-6.344	Moussa, Muijlwijk, et al., 1966	Coefficents calculated by NIST from author's data.

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:

Gas phase ion energetics data

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

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Notes

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

Symbols used in this document:

AE	Appearance energy
IE (evaluated)	Recommended ionization energy
P_c	Critical pressure
P_triple	Triple point pressure
S°_{gas,1 bar}	Entropy of gas at standard conditions (1 bar)
T	Temperature
T_boil	Boiling point
T_c	Critical temperature
T_fus	Fusion (melting) point
T_triple	Triple point 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
Δ_vapH	Enthalpy of vaporization
ρ_c	Critical density

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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