Nitrogen cation

Formula: N₂⁺
Molecular weight: 28.0129
IUPAC Standard InChI: InChI=1S/N2/c1-2/q+1
IUPAC Standard InChIKey: OCLMUTJUZGFVFC-UHFFFAOYSA-N
CAS Registry Number: 13966-04-6
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.
Permanent link for this species. Use this link for bookmarking this species for future reference.
Information on this page:
Other data available:
- Gas phase thermochemistry data
Data at other public NIST sites:
- Electron-Impact Ionization Cross Sections (on physics web site)
Options:
- Switch to calorie-based units

Reaction thermochemistry data

Go To: Top, Ion clustering data, Constants of diatomic molecules, References, Notes

Data compiled by: Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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.

Individual Reactions

Nitrogen cation + = ( • )

By formula: N₂⁺ + N₂ = (N₂⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	102. to 102.	kJ/mol	RNG	N/A	Range of 6 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.9	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Δ_rS°	67.8	J/mol*K	PHPMS	Teng and Conway, 1973	gas phase
Δ_rS°	81.6	J/mol*K	PHPMS	Payzant and Kebarle, 1970	gas phase
Δ_rS°	46.	J/mol*K	DT	Varney, 1968	gas phase; Entropy change is questionable
Δ_rS°	-4.	J/mol*K	DT	Varney, 1959	gas phase; Entropy change is questionable

Nitrogen cation + = ( • )

By formula: N₂⁺ + Ar = (N₂⁺ • Ar)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	112.	kJ/mol	PD/KERD	Kim and Bowers, 1990	gas phase; switching reaction(N2+)N2; Hiraoka and Nakajima, 1988
Δ_rH°	106.	kJ/mol	PHPMS	Teng and Conway, 1973	gas phase; switching reaction(N2+)N2
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.6	J/mol*K	PD/KERD	Kim and Bowers, 1990	gas phase; switching reaction(N2+)N2; Hiraoka and Nakajima, 1988
Δ_rS°	57.3	J/mol*K	PHPMS	Teng and Conway, 1973	gas phase; switching reaction(N2+)N2

( Nitrogen cation • 7) + = ( • 8)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.40	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; Entropy change calculated or estimated
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	71.	J/mol*K	N/A	Hiraoka, Mori, et al., 1992	gas phase; Entropy change calculated or estimated

( Nitrogen cation • 8) + = ( • 9)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.36	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; Entropy change calculated or estimated
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	71.	J/mol*K	N/A	Hiraoka, Mori, et al., 1992	gas phase; Entropy change calculated or estimated

( Nitrogen cation • ) + = ( • 2)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.5 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Δ_rH°	5.9	kJ/mol	PI	Linn, Ono, et al., 1981	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	62.8	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • ) + = ( • 2)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	16.	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; Δ_rH>
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	71.	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; Δ_rH>

( Nitrogen cation • 10) + = ( • 11)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.9 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.5	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 9) + = ( • 10)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.4 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	86.6	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 2) + = ( • 3)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.3 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	66.1	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 3) + = ( • 4)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.5 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	69.5	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 4) + = ( • 5)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.3 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	85.8	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 5) + = ( • 6)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.5 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	90.8	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 6) + = ( • 7)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.5 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	85.4	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 7) + = ( • 8)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.8 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	80.8	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 8) + = ( • 9)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.4 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.6	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 2) + = ( • 3)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.3 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	57.3	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase

( Nitrogen cation • 3) + = ( • 4)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.0 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	74.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase

( Nitrogen cation • 4) + = ( • 5)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.6 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	71.1	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase

( Nitrogen cation • 5) + = ( • 6)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.5 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	72.8	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase

( Nitrogen cation • 6) + = ( • 7)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.4 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	72.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase

Nitrogen cation + = ( • )

By formula: N₂⁺ + He = (N₂⁺ • He)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.	kJ/mol	PDiss	Bieske, Soliva, et al., 1990	gas phase; same Δ_rH for N2+(B) and (N2+)X; ab initio, Miller, Tennyson, et al., 1988

Ion clustering data

Go To: Top, Reaction thermochemistry data, Constants of diatomic molecules, References, Notes

Data compiled by: Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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

Nitrogen cation + = ( • )

By formula: N₂⁺ + Ar = (N₂⁺ • Ar)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	112.	kJ/mol	PD/KERD	Kim and Bowers, 1990	gas phase; switching reaction(N2+)N2; Hiraoka and Nakajima, 1988
Δ_rH°	106.	kJ/mol	PHPMS	Teng and Conway, 1973	gas phase; switching reaction(N2+)N2
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.6	J/mol*K	PD/KERD	Kim and Bowers, 1990	gas phase; switching reaction(N2+)N2; Hiraoka and Nakajima, 1988
Δ_rS°	57.3	J/mol*K	PHPMS	Teng and Conway, 1973	gas phase; switching reaction(N2+)N2

( Nitrogen cation • ) + = ( • 2)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	16.	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; Δ_rH>
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	71.	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; Δ_rH>

( Nitrogen cation • 2) + = ( • 3)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.3 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	57.3	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase

( Nitrogen cation • 3) + = ( • 4)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.0 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	74.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase

( Nitrogen cation • 4) + = ( • 5)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.6 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	71.1	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase

( Nitrogen cation • 5) + = ( • 6)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.5 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	72.8	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase

( Nitrogen cation • 6) + = ( • 7)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.4 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	72.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase

( Nitrogen cation • 7) + = ( • 8)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.40	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; Entropy change calculated or estimated
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	71.	J/mol*K	N/A	Hiraoka, Mori, et al., 1992	gas phase; Entropy change calculated or estimated

( Nitrogen cation • 8) + = ( • 9)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.36	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; Entropy change calculated or estimated
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	71.	J/mol*K	N/A	Hiraoka, Mori, et al., 1992	gas phase; Entropy change calculated or estimated

Nitrogen cation + = ( • )

By formula: N₂⁺ + He = (N₂⁺ • He)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	2.	kJ/mol	PDiss	Bieske, Soliva, et al., 1990	gas phase; same Δ_rH for N2+(B) and (N2+)X; ab initio, Miller, Tennyson, et al., 1988

Nitrogen cation + = ( • )

By formula: N₂⁺ + N₂ = (N₂⁺ • N₂)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	102. to 102.	kJ/mol	RNG	N/A	Range of 6 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	87.9	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Δ_rS°	67.8	J/mol*K	PHPMS	Teng and Conway, 1973	gas phase
Δ_rS°	81.6	J/mol*K	PHPMS	Payzant and Kebarle, 1970	gas phase
Δ_rS°	46.	J/mol*K	DT	Varney, 1968	gas phase; Entropy change is questionable
Δ_rS°	-4.	J/mol*K	DT	Varney, 1959	gas phase; Entropy change is questionable

( Nitrogen cation • ) + = ( • 2)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.5 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Δ_rH°	5.9	kJ/mol	PI	Linn, Ono, et al., 1981	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	62.8	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 2) + = ( • 3)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	11.3 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	66.1	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 3) + = ( • 4)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.5 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	69.5	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 4) + = ( • 5)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	10.3 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	85.8	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 5) + = ( • 6)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	9.5 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	90.8	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 6) + = ( • 7)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	8.5 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	85.4	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 7) + = ( • 8)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.8 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	80.8	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 8) + = ( • 9)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.4 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	81.6	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 9) + = ( • 10)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7.4 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	86.6	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

( Nitrogen cation • 10) + = ( • 11)

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

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	6.9 ± 0.8	kJ/mol	PHPMS	Hiraoka and Nakajima, 1988	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.5	J/mol*K	PHPMS	Hiraoka and Nakajima, 1988	gas phase

Constants of diatomic molecules

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

Data compiled by: Klaus P. Huber and Gerhard H. Herzberg

Data collected through March, 1977

Symbols used in the table of constants
Symbol	Meaning
State	electronic state and / or symmetry symbol
T_e	minimum electronic energy (cm^-1)
ω_e	vibrational constant – first term (cm^-1)
ω_ex_e	vibrational constant – second term (cm^-1)
ω_ey_e	vibrational constant – third term (cm^-1)
B_e	rotational constant in equilibrium position (cm^-1)
α_e	rotational constant – first term (cm^-1)
γ_e	rotation-vibration interaction constant (cm^-1)
D_e	centrifugal distortion constant (cm^-1)
β_e	rotational constant – first term, centrifugal force (cm^-1)
r_e	internuclear distance (Å)
Trans.	observed transition(s) corresponding to electronic state
ν₀₀	position of 0-0 band (units noted in table)

Diatomic constants for ¹⁴N₂⁺
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
Several other much weaker X-ray emissions corresponding to higher levels of N₂⁺.
↳Werme, Grennberg, et al., 1973; Werme, Grennberg, et al., 1973, 2
x 2											x → C	384.5 eV 1
x 2	↳Werme, Grennberg, et al., 1973; Werme, Grennberg, et al., 1973, 2
x											x → B	391.33 eV
	↳Werme, Grennberg, et al., 1973; Werme, Grennberg, et al., 1973, 2
											x → A 3	393.34 eV
	↳Werme, Grennberg, et al., 1973; Werme, Grennberg, et al., 1973, 2
											x → X	394.40 eV 4
	↳Werme, Grennberg, et al., 1973; Werme, Grennberg, et al., 1973, 2
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
G ²Σ_g⁺	(195000) 5
G ²Σ_g⁺	↳Gardner and Samson, 1975
C ²Σ_u⁺	64608.₁ 6	2071.5 6 Z	9.2₉ 7	-0.43	[1.509₈]	8 9		4.0E-6		[1.262₈]	C 10 → X R	64542.0 Z
C ²Σ_u⁺	↳Tanaka, 1953; missing citation; missing citation; Lofthus and Krupenie, 1977
D ²Π_gi	52318.2 11	907.7₁ Z	11.91 12	0.016	1.113	0.020		5E-6		1.471	D → A R	42654.0 Z
D ²Π_gi	↳missing citation; Janin, d'Incan, et al., 1963
(a ⁴Σ_u⁺)	(25467)	(2398)	(14)		(2.071)	(0.014)					(a → X) 13	(25563.26)
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
B ²Σ_u⁺	25461.4₆	2419.84 Z	23.18₉ 14 15	-0.537₅	[2.07456] 16 17	0.024 18		6.17E-6		1.074₂	B ↔ X 19 20 VR	25566.04 Z
B ²Σ_u⁺	↳missing citation; Coster and Brons, 1931; Douglas, 1952; missing citation; Klynning and Pages, 1972; Colbourn and Douglas, 1977
A ²Π_ui	9166.9₅ 21	1903.7₀ 22 Z	15.02 15		1.7444 23 17	0.0188₃ 23		5.6E-6 23		1.1749	A → X 24 25 R	9015.5₇ Z
A ²Π_ui	↳Douglas, 1953; Colbourn and Douglas, 1977
X ²Σ_g⁺	0	2207.00 Z	16.10 26 15	-0.040	1.93176 27 17	0.01881		[6.10E-6] 28		1.11642

Notes

Vertical transition.

K state of N₂ (removal of one K electron)

Consisting of a v" progression (v"= 0...5).

Observed X-ray emission line leading to X ²Σ_g⁺(v=0); the value predicted from the K limit and I.P.(N2) is 393.9 eV. The X-ray line has a shoulder at 394.1₇ eV probably corresponding to v"=1.

Repulsive state corresponding to removal of a 2σ_g electron and dissociating into N(⁴S) + N⁺(2s2p³ ³P), observed in photoelectron and photoion spectra with maximum at 39.8 and limit at 37.8₆ eV.

Different constants are derived by Joshi, 1966 who assumes that the levels v=0,1,2 are perturbed and therefore does not include them in the evaluation: he gives T_e = 64562.93 cm^-1 Joshi, 1966.

Vibrational numbering confirmed by ¹⁴N-¹⁵N isotope shifts Baer and Miescher, 1953, Namioka, Yoshino, et al., 1963, Joshi, 1966, 2. Additional vibrational levels (to v'=17) observed by Asbrink and Fridh, 1974 in the photoelectron spectrum.

B_v(v=1)= 1.509₆, B_v(v=2)= 1.503₅, B_v(v=3)= 1.497₀, B_v(v=4)= 1.489₈, B_v(v=5)= 1.480₄, B_v(v=6)= 1.470₀. The shape of the B_v curve is anomalous; meaningful equilibrium constants have not been determined. Spin doubling partially resolved for high N values Carroll, 1959.

In a discharge through He+N₂ the v'=3 bands are strongly enhanced. It has been suggested Douglas, 1952 that this enhancement is due to inverse predissociation, i.e. N(⁴S) + N⁺(³P) → N₂⁺(C ²Σ_u⁺): see also Carroll, 1959. Direct predissociation, i.e. the production of N⁺ ions, has been observed mass- spectrometrically Wankenne and Momigny, 1971, Wankenne, Bolduc, et al., 1975: see also Fournier, Ozenne, et al., 1970, Fournier, van de Runstraat, et al., 1971. According to Wankenne and Momigny, 1971 the "metastable" ion N₂⁺(C ²Σ_u⁺) has a lifetime of 0.8 μs before radiationless decomposition; see, however, van de Runstraat, de Heer, et al., 1974 and 10. The question which state causes the predissociation has been the subject of much discussion Lorquet and Lorquet, 1974, Tellinghuisen and Albritton, 1975, Roche and Lefebvre-Brion, 1975 following the discovery of a large isotope effect on this predissociation Govers, van de Runstraat, et al., 1973, Govers, Fehsenfeld, et al., 1974, van de Runstraat, de Heer, et al., 1974, Govers, van de Runstraat, et al., 1975. See also Fournier, Govers, et al., 1972. Another predissociation limit at 26.70 eV above N₂(X ¹Σ_g⁺,v=0) and corresponding to ²D⁰ + ³P has been observed by Asbrink and Fridh, 1974.

Radiative lifetime of the nonpredissociated levels τ(v≤2) = 0.09 μs Fournier, van de Runstraat, et al., 1971.

A = -16.5.

Vibrational numbering confirmed by ¹⁴N-¹⁵N isotope shifts Namioka, Yoshino, et al., 1963.

The identification of this quartet-doublet transition by d'Incan and Topouzkhanian, 1975 has been questioned by Dressler, 1976 who considers it as the first negative system of ¹⁴N¹⁵N⁺.

ω_ez_e = -0.0495; these constants, derived from ω₀, ω₀x₀, ... of Coster and Brons, 1931, represent the unperturbed vibrational levels only to v=10: for v>10 the ΔG curve shows a positive curvature. Levels observed up to v=29 Douglas, 1952.

Experimental Franck-Condon factors for photoionization into these states from the ground state of N₂ Spohr and Puttkamer, 1967, Comes and Speier, 1971, Gardner and Samson, 1974; theoretical Franck-Condon factors Lofthus and Krupenie, 1977, Albritton, Schmeltekopf, et al., 1979; see also Kosinov and Skovorodko, 1973, Lee and Rabalais, 1974.

Spin splitting constant γ₀ = +0.0229 Colbourn and Douglas, 1977: γ' - γ" = 0.015 Bouchoux, Bacis, et al., 1976. Rotational intensity distribution Bouchoux, Bacis, et al., 1976; see also Desesquelles, Cao, et al., 1975.

RKR potential functions Singh and Rai, 1966, see also Joshi, 1966, 3, Hajj, 1975.

Valid only to v=3. Rotational perturbations by A ²Π_u in v=1,3,5,8,9,13; see Herzberg, 1928, Coster and Brons, 1931, Childs, 1932, Parker, 1933, Brons, 1934, Klynning and Pages, 1972.

Lifetime τ(v=0) = 60.5 ns Dotchin and Chupp, 1973, Smith, Read, et al., 1975, see Dotchin and Chupp, 1973, Smith, Read, et al., 1975 and earlier work quoted by them. Perturbed rotational levels (e.g. v=1, N=13,14) have lifetimes up to τ(v=1,N=13,14)= 95 ns Dufayard, Negre, et al., 1974. f₀₀= 0.019 Nicholls, 1963; the electronic f value at the wavelength of the 0-1 band is f= 0.034 Wray and Connolly, 1965.

Observed in absorption in flash discharges Herzberg, 1968; laser-induced fluorescence Engelking and Smith, 1975. From intensity measurements Lee and Judge, 1973 conclude that the electronic transition moment is nearly independent of r; see, however, Nicholls, 1963, Kiselyovskii and Shimanovich, 1968, Brown and Landshoff, 1971. Franck-Condon factors Grandmontagne, Jorus, et al., 1970, Comes and Speier, 1971, Lofthus and Krupenie, 1977.

A(v=2,3)= -74.62, small J dependence Colbourn and Douglas, 1977.

From Janin, d'Incan, et al., 1963; Colbourn and Douglas, 1977 give ΔG(5/2) = 1813.32₇. Levels observed in nitrogen ion beams to v=30 Maier and Holland, 1973. Vibrational numbering confirmed by ¹⁵N₂⁺ data Liu, 1959.

From the rotational constants for v=2,3 Colbourn and Douglas, 1977; also Λ-type doubling constants. For higher but less accurate B_v values see Janin, d'Incan, et al., 1963. β_e = +0.18E-6 Colbourn and Douglas, 1977.

Lifetime varies from 13.9 μs for v=1 to 7.3 μs for v=8: see Peterson and Moseley, 1973,who give references to earlier work, and Gray, Roberts, et al., 1972, Maier and Holland, 1973. Transition probabilities, f values: f₀₀= 0.00168 Cartwright, 1973.

The bands were observed in the aurora Meinel, 1950 before they were discovered in the laboratory Douglas, 1953. Dependence of the electronic transition moment on r Koppe, Koval, et al., 1968, Cartwright, 1973, Maier and Holland, 1973, Wu and Shemansky, 1976, Mandelbaum and Feldman, 1976.

These constants Klynning and Pages, 1972 are only very slightly different from those implied by Douglas, 1952 who gives ω₀, ω₀x₀ ... ΔG(1/2) = 2174.72₈ Colbourn and Douglas, 1977.

From B₀ and B₁ of Colbourn and Douglas, 1977. Spin splitting constant γ(v=0,1) =0.0083 Colbourn and Douglas, 1977; see also Bouchoux, Bacis, et al., 1976.

D₁ = 6.38E-6 Colbourn and Douglas, 1977: higher, less accurate D_v values in Klynning and Pages, 1972.

From D₀⁰(N₂) + I.P.(N) - I.P.(N₂).

From the electron impact appearance potential of N₂⁺⁺ Dorman and Morrison, 1963 and I.P.(N₂). See also Appell, Durup, et al., 1973 and ref. given there.

References

Go To: Top, Reaction thermochemistry data, Ion clustering data, Constants of diatomic molecules, Notes

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]

Kim and Bowers, 1990
Kim, H.S.; Bowers, M.T., Energetics, Structure and Photodissociation Dynamics of the Cluster Ar.N2+, J. Chem. Phys., 1990, 93, 2, 1158, https://doi.org/10.1063/1.459179 . [all data]

Hiraoka, Mori, et al., 1992
Hiraoka, K.; Mori, T.; Yamabe, S., Gas-Phase Solvation of N2+ with Ar Atoms - A Charge Switch in the Reaction N2+(Ar)...Ar+(N2), Chem. Phys. Lett., 1992, 189, 1, 7, https://doi.org/10.1016/0009-2614(92)85144-Y . [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]

Bieske, Soliva, et al., 1990
Bieske, E.J.; Soliva, A.; Welker, M.A.; Maier, J.P., The B<---X Electronic Spectrum of N2+ He, J. Chem. Phys., 1990, 93, 6, 4477, https://doi.org/10.1063/1.458732 . [all data]

Miller, Tennyson, et al., 1988
Miller, S.; Tennyson, J.; Follmeg, B.; Rosmus, P.; Werner, H., Ab initio Investigation of the Bond Rovibrational States in the Electronic Ground State of HeN2+, J. Chem. Phys., 1988, 89, 4, 2178, https://doi.org/10.1063/1.455062 . [all data]

Werme, Grennberg, et al., 1973
Werme, L.O.; Grennberg, B.; Nordgren, J.; Nordling, C.; Siegbahn, K., Fine structure in the x-ray emission spectrum of N₂, compared with electron spectroscopy, Nature (London), 1973, 242, 453. [all data]

Werme, Grennberg, et al., 1973, 2
Werme, L.O.; Grennberg, B.; Nordgren, J.; Nordling, C.; Siegbahn, K., Observation of vibrational fine structure in x-ray emission lines, Phys. Rev. Lett., 1973, 30, 523. [all data]

Gardner and Samson, 1975
Gardner, J.L.; Samson, J.A.R., Photion and photelectron spectroscopy of CO and N₂, J. Chem. Phys., 1975, 62, 1447. [all data]

Tanaka, 1953
Tanaka, Y., Extension of the N₂⁺ (C→X) bands in the far ultraviolet region, J. Chem. Phys., 1953, 21, 1402. [all data]

Lofthus and Krupenie, 1977
Lofthus, A.; Krupenie, P.H., The spectrum of molecular nitrogen, J. Phys. Chem. Ref. Data, 1977, 6, 113. [all data]

Janin, d'Incan, et al., 1963
Janin, J.; d'Incan, J.; Stringat, R.; Magnaval, J., Nouvelle analyse du systeme D²Π_g-A²Π_u de la molecule N₂⁺, Rev. Opt. Theor. Instrum., 1963, 42, 120. [all data]

Coster and Brons, 1931
Coster, D.; Brons, H.H., Uber einige "Schwanzbanden" der negativen stickstoff-gruppe, Z. Phys., 1931, 70, 492. [all data]

Douglas, 1952
Douglas, A.E., The near ultraviolet bands of N₂⁺ and the dissociation energies of the N₂⁺ and N₂ molecules, Can. J. Phys., 1952, 30, 302. [all data]

Klynning and Pages, 1972
Klynning, L.; Pages, P., On the first negative system of N₂⁺, Phys. Scr., 1972, 6, 195. [all data]

Colbourn and Douglas, 1977
Colbourn, E.A.; Douglas, A.E., A remeasurement of some constants of the O₂⁺ and N₂⁺ molecules, J. Mol. Spectrosc., 1977, 65, 332. [all data]

Douglas, 1953
Douglas, A.E., Analysis of the ²Π-²Σ bands of the N₂⁺ molecule, Astrophys. J., 1953, 117, 380. [all data]

Joshi, 1966
Joshi, K.C., The spectrum of the C-X system of N₂⁺, Proc. Phys. Soc. London, 1966, 87, 285. [all data]

Baer and Miescher, 1953
Baer, P.; Miescher, E., NO-, NO⁺- und N₂⁺-Emissionsspektren im Schumanngebiet, Helv. Phys. Acta, 1953, 26, 91. [all data]

Namioka, Yoshino, et al., 1963
Namioka, T.; Yoshino, K.; Tanaka, Y., Isotope bands and the vibration assignment of the D²Π_g-A²Π_u system of N₂⁺, J. Chem. Phys., 1963, 39, 2629. [all data]

Joshi, 1966, 2
Joshi, K.C., The C²Σ_u⁺ - X²Σ_g⁺ system of ¹⁵N₂⁺, Proc. Phys. Soc. London, 1966, 87, 561. [all data]

Asbrink and Fridh, 1974
Asbrink, L.; Fridh, C., The C state of N₂⁺, studied by photoelectron spectroscopy, Phys. Scr., 1974, 9, 338. [all data]

Carroll, 1959
Carroll, P.K., The C-X system of N₂⁺, Can. J. Phys., 1959, 37, 880. [all data]

Wankenne and Momigny, 1971
Wankenne, H.; Momigny, J., Monomolecular and collision-induced predissociation in the mass spectrum of N₂⁺, Int. J. Mass Spectrom. Ion Phys., 1971, 7, 227. [all data]

Wankenne, Bolduc, et al., 1975
Wankenne, H.; Bolduc, E.; Marmet, P., Ionisation dissociative de N₂, Can. J. Phys., 1975, 53, 770. [all data]

Fournier, Ozenne, et al., 1970
Fournier, P.; Ozenne, J.-B.; Durup, J., Vibrational structure of predissociating molecular states: velocity spectrum of N⁺ fragments from fast N₂⁺ ions, J. Chem. Phys., 1970, 53, 4095. [all data]

Fournier, van de Runstraat, et al., 1971
Fournier, P.; van de Runstraat, C.A.; Govers, T.R.; Schopman, J.; De Heer, F.J.; Los, J., Collision-induced dissociation of 10 keV N₂⁺ ions: evidence for predissociation of the C²Σ_u⁺ state, Chem. Phys. Lett., 1971, 9, 426. [all data]

van de Runstraat, de Heer, et al., 1974
van de Runstraat, C.A.; de Heer, F.J.; Govers, T.R., Excitation and decay of the C²Σ_u⁺ state of N₂⁺ in the case of electron impact on N₂, Chem. Phys., 1974, 3, 431. [all data]

Lorquet and Lorquet, 1974
Lorquet, A.J.; Lorquet, J.C., Isotopic effects in accidental predissociation. The case of the C²Σ_u⁺ state of N₂⁺, Chem. Phys. Lett., 1974, 26, 138. [all data]

Tellinghuisen and Albritton, 1975
Tellinghuisen, J.; Albritton, D.L., Predissociation of the C²Σ⁺_u state of N₂⁺, Chem. Phys. Lett., 1975, 31, 91-96. [all data]

Roche and Lefebvre-Brion, 1975
Roche, A.L.; Lefebvre-Brion, H., Some ab initio calculations related to the predissociation of the C²Σ_u⁺ state of N₂⁺, Chem. Phys. Lett., 1975, 32, 155. [all data]

Govers, van de Runstraat, et al., 1973
Govers, T.R.; van de Runstraat, C.A.; de Heer, F.J., Isotope effects in the predissociation of the C²Σ_u⁺ state of N₂⁺, J. Phys. B:, 1973, 6, 73. [all data]

Govers, Fehsenfeld, et al., 1974
Govers, T.R.; Fehsenfeld, F.C.; Albritton, D.L.; Fournier, P.G.; Fournier, J., Molecular isotope effects in the thermal-energy charge exchange between He⁺ and N₂, Chem. Phys. Lett., 1974, 26, 134. [all data]

Govers, van de Runstraat, et al., 1975
Govers, T.R.; van de Runstraat, C.A.; de Heer, F.J., Excitation and decay of the C²Σ_u⁺ state of N₂⁺ following collisions of He⁺ ions with N₂ isotopes, Chem. Phys., 1975, 9, 285. [all data]

Fournier, Govers, et al., 1972
Fournier, P.G.; Govers, T.R.; van de Runstraat, C.A.; Schopman, J.; Los, J., Translational spectroscopy of the unimolecular dissociation N₂⁺ → N⁺ + N, J. Phys. (Paris), 1972, 33, 755. [all data]

d'Incan and Topouzkhanian, 1975
d'Incan, J.; Topouzkhanian, A., High resolution analysis of collision-induced N₂⁺ spectrum, J. Chem. Phys., 1975, 63, 2683. [all data]

Dressler, 1976
Dressler, K., On the reported ⁴Σ_u⁺-²Σ_g⁺ transition of N₂⁺, J. Chem. Phys., 1976, 64, 3493. [all data]

Spohr and Puttkamer, 1967
Spohr, R.; Puttkamer, E.v., Energiemessung von Photoelektronen und Franck-Condon-Faktoren der Schwingungsubergange einiger Molekulionen, Z. Naturforsch., 1967, 22a, 705. [all data]

Comes and Speier, 1971
Comes, F.J.; Speier, F., Luminescence of diatomic molecular ions. I. Franck-Condon-factors and collisional deactivation, Z. Naturforsch. A, 1971, 26, 1998. [all data]

Gardner and Samson, 1974
Gardner, J.L.; Samson, J.A.R., Experimental vibrational intensity distributions for continuum photoionization to the X²Σ⁺, A²Π, and B²Σ⁺ states of CO⁺ and N₂⁺, J. Chem. Phys., 1974, 60, 3711. [all data]

Albritton, Schmeltekopf, et al., 1979
Albritton; Schmeltekopf; Zare, Diatomic Intensity Factors, to be published, cited in Huber and Herzberg, 1979, Wiley, 1979, 1. [all data]

Kosinov and Skovorodko, 1973
Kosinov, V.A.; Skovorodko, P.A., Calculation of the Franck-Condon factors for the processes involved in the excitation of the molecular bands of the first negative system of nitrogen and carbon monoxide, Opt. Spectrosc. Engl. Transl., 1973, 35, 344, In original 587. [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]

Bouchoux, Bacis, et al., 1976
Bouchoux, A.M.; Bacis, R.; Goure, J.P.; Lambert, A.M., Relative intensities of the rotational lines of the (0, 0) and (0, 1) bands of the B²Σ_u⁺ - X²Σ_g⁺ systems of N₂⁺, J. Quant. Spectrosc. Radiat. Transfer, 1976, 16, 451. [all data]

Desesquelles, Cao, et al., 1975
Desesquelles, J.; Cao, G.D.; Vaissade, A., Etude de l'excitation rotationnelle de l'etat B²Σ de N₂⁺ par impact d'ions lourds, J. Phys. (Paris), 1975, 36, 795. [all data]

Singh and Rai, 1966
Singh, R.B.; Rai, D.K., Potential-energy curves for O₂⁺, N₂⁺, and CO⁺, J. Mol. Spectrosc., 1966, 19, 424. [all data]

Joshi, 1966, 3
Joshi, K.C., Potential energy curves for the C²Σ_u⁺ and X²Σ_g⁺ states of N₂⁺, J. Quant. Spectrosc. Radiat. Transfer, 1966, 6, 211. [all data]

Hajj, 1975
Hajj, F.Y., Internuclear potential for the B state of N₂⁺, Phys. Lett. A, 1975, 50, 427. [all data]

Herzberg, 1928
Herzberg, G., 1. Uber die struktur der negativen stickstoffbanden, Ann. Phys. (Vierte Folge), 1928, 86, 189. [all data]

Childs, 1932
Childs, W.H.J., Peturbations and rotation constants of some first negative nitrogen bands, Proc. R. Soc. London A, 1932, 137, 641. [all data]

Parker, 1933
Parker, A.E., Rotational analysis of the perturbed (13,15) ²Σ - ²Σ N₂⁺ band, Phys. Rev., 1933, 44, 90. [all data]

Brons, 1934
Brons, H.H., Perturbations in the (9,8) ²Σ→²Σ N₂⁺-band, Physica (The Hague), 1934, 1, 739. [all data]

Dotchin and Chupp, 1973
Dotchin, L.W.; Chupp, E.L., Radiative lifetimes and pressure dependence of the relaxation rates of some vibronic levels in N₂⁺, N₂, CO⁺, and CO, J. Chem. Phys., 1973, 59, 3960. [all data]

Smith, Read, et al., 1975
Smith, A.J.; Read, F.H.; Imhof, R.E., Measurement of the lifetimes of ionic excited states using the inelastic electron-photon delayed coincidence technique, J. Phys. B:, 1975, 8, 2869. [all data]

Dufayard, Negre, et al., 1974
Dufayard, J.; Negre, J.M.; Nedelec, O., Perturbation effects on lifetimes in N₂⁺, J. Chem. Phys., 1974, 61, 3614. [all data]

Nicholls, 1963
Nicholls, R.W., Einstein A coefficients, oscillator strengths and absolute band strengths for the N₂ second positive and N₂⁺ first negative systems, J. Atmos. Terr. Phys., 1963, 25, 218. [all data]

Wray and Connolly, 1965
Wray, K.L.; Connolly, T.J., Electronic f-number of the N₂⁺(1-) band system, J. Quant. Spectrosc. Radiat. Transfer, 1965, 5, 633. [all data]

Herzberg, 1968
Herzberg, G., Absorption spectra of molecular ions, Comment. Pontif. Acad. Sci., 1968, 2, 15, 1-8. [all data]

Engelking and Smith, 1975
Engelking, P.C.; Smith, A.L., Tunable laser fluorescence spectroscopy of the molecular nitrogen cation at 390 nm, Chem. Phys. Lett., 1975, 36, 21. [all data]

Lee and Judge, 1973
Lee, L.C.; Judge, D.L., The electronic transition moment of the N₂⁺ (B²Σ_u⁺ → X²Σ_g⁺) system, J. Phys. B:, 1973, 6, 121. [all data]

Kiselyovskii and Shimanovich, 1968
Kiselyovskii, L.I.; Shimanovich, V.D., Experimental determination of the matrix elements of the electronic transition dipole moment in the first negative band system of the N₂⁺ molecule using an arc filament in an axial-vortex air flow, Opt. Spectrosc. Engl. Transl., 1968, 24, 266, In original 506. [all data]

Brown and Landshoff, 1971
Brown, W.A.; Landshoff, R.K., The electronic transition moment of the N₂⁺ first negative system, J. Quant. Spectrosc. Radiat. Transfer, 1971, 11, 1143. [all data]

Grandmontagne, Jorus, et al., 1970
Grandmontagne, R.; Jorus, A.-M.; Vincent, F., Calcul theorique des intensites de bandes du premier systeme negatif de l'azote, J. Phys. (Paris), 1970, 31, 749. [all data]

Maier and Holland, 1973
Maier, W.B., II; Holland, R.F., Visible and near ultraviolet light produced by the radiative decay of the long-lived states in a nitrogen ion beam, J. Chem. Phys., 1973, 59, 4501. [all data]

Liu, 1959
Liu, I.D., The vibrational numbering of the A²Π-X²Σ bands of N₂⁺, Astrophys. J., 1959, 129, 516. [all data]

Peterson and Moseley, 1973
Peterson, J.R.; Moseley, J.T., Time-of-flight determination of lifetimes of N₂⁺(A²Π_u)- the Meinel band system, J. Chem. Phys., 1973, 58, 172. [all data]

Gray, Roberts, et al., 1972
Gray, D.D.; Roberts, T.D.; Morack, J.L., Measured lifetimes of some A ²Π_u vibrational levels of N₂⁺ molecules, J. Chem. Phys., 1972, 57, 4190. [all data]

Cartwright, 1973
Cartwright, D.C., Transition probabilities for the Meinel band system of N₂⁺, J. Chem. Phys., 1973, 58, 178. [all data]

Meinel, 1950
Meinel, A.B., A new band system of N₂⁺ in the infrared auroral spectrum, Astrophys. J., 1950, 112, 562. [all data]

Koppe, Koval, et al., 1968
Koppe, V.T.; Koval, A.G.; Gritsyna, V.V.; Fogel, Ya.M., Dependence of the electronic transition moment R_e upon the internuclear spacing r for the Meinel band system of the N₂⁺ ion, Opt. Spectrosc. Engl. Transl., 1968, 24, 440. [all data]

Wu and Shemansky, 1976
Wu, H.H.; Shemansky, D.E., Electronic transition moment of the N₂⁺(A²Π_u-X²Σ_g⁺) system, J. Chem. Phys., 1976, 64, 1134. [all data]

Mandelbaum and Feldman, 1976
Mandelbaum, D.; Feldman, P.D., Electron impact excitation of the Meinel band system of N₂⁺, J. Chem. Phys., 1976, 65, 672. [all data]

Dorman and Morrison, 1963
Dorman, F.H.; Morrison, J.D., Ionization potentials of doubly charged oxygen and nitrogen, J. Chem. Phys., 1963, 39, 1906. [all data]

Appell, Durup, et al., 1973
Appell, J.; Durup, J.; Fehsenfeld, F.C.; Fournier, P., Double charge transfer spectroscopy of diatomic molecules, J. Phys. B:, 1973, 6, 197. [all data]

Huber and Herzberg, 1979
Huber, K.P.; Herzberg, G., Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules, Van Nostrand Reinhold Company, New York, 1979, 716. [all data]

Notes

Go To: Top, Reaction thermochemistry data, Ion clustering data, Constants of diatomic molecules, References

Symbols used in this document:

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.

Δ_rH°	Enthalpy of reaction at standard conditions
Δ_rS°	Entropy of reaction at standard conditions