Nitrogen anion

Formula: N₂^-
Molecular weight: 28.0139
CAS Registry Number: 12185-02-3
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Constants of diatomic molecules

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

Data collected through May, 1976

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
Theoretical calculations of N₂^- states Thulstrup and Andersen, 1975.
Additional resonances in electron scattering at higher energies, several of them assiciated with the lowest N₂ Rydberg states which derive from A ²Π_u of N₂⁺.
↳Mazeau, Hall, et al., 1973; Schulz, 1973; Golden, Burns, et al., 1974
E ²Σ_g⁺	(77150) 1	(2180) 1	(16) 1							1.11₅ 1
E ²Σ_g⁺	↳Comer and Read, 1971
Two long progressions of shape resonances in electron scattering at 8.2 - 9.6 and 9.0 - 11.2 eV above X ¹Σ_g⁺ (v=0) of N₂. They correspond to negative ion formation with subsequent decay to A ³Σ_u⁺ and B ³Π_g, respectively, of neutral N₂.
↳Sanche and Schulz, 1972; Mazeau, Gresteau, et al., 1973; Schulz, 1973
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
X ²Π_g	0d	(1968) 2 3	(10) 2							1.19₃ 2
X ²Π_g	↳Brailsford, Morton, et al., 1969

Notes

Molecular constants estimated by Comer and Read, 1971 from a short progression of three very sharp resonances in electron scattering at 11.48, 11.75, 12.02 eV above X ¹Σ_g⁺(v=0) of N₂. The parent is the E ³Σ_g⁺ Rydberg state of N₂, the grandparent X ²Σ_g⁺(v=0) of N₂⁺.

Ground state constants derived by Birtwistle and Herzenberg, 1971 from a comparison of experimental with calculated cross sections for the vibrational excitation of N₂ by resonance scattering of electrons in the 2-4 eV region. The vibrational levels have a considerable width owing to preionization, but the width parameter Γ decreases rapidly with increasing r from 0.57 eV at r_e(N₂).

Holzer, Murphy, et al., 1969 observe ΔG(1/2) ~ 1840 Holzer, Murphy, et al., 1969 for N₂^- in potassium halide single crystals.

From D₀⁰(N₂) and the e1ectron affinities of N₂ and N, assuming for the latter -0.07 eV as given by Hotop and Lineberger, 1975.

From the energy difference (corrected for zero-point energy) of the potential minima given by Birtwistle and Herzenberg, 1971; see 2.

The minimum of the ground state potential function lies 1.92₅ eV above that of N₂ Birtwistle and Herzenberg, 1971; see 2.

Spectrum of N₂- in potassium halides, confirming the ²Π nature of the ground state.

References

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Thulstrup and Andersen, 1975
Thulstrup, E.W.; Andersen, A., Configuration interaction studies of bound, low-lying states of N₂^-, N₂, N₂⁺ and N₂²⁺, J. Phys. B:, 1975, 8, 965. [all data]

Mazeau, Hall, et al., 1973
Mazeau, J.; Hall, R.I.; Joyez, G.; Landau, M.; Reinhardt, J., Electron exitation of N₂. II. Resonant phenomena associated with Rydberg states, J. Phys. B:, 1973, 6, 873. [all data]

Schulz, 1973
Schulz, G.J., Resonances in electron impact on diatomic molecules, Rev. Mod. Phys., 1973, 45, 423. [all data]

Golden, Burns, et al., 1974
Golden, D.E.; Burns, D.J.; Sutcliffe, V.C., Jr., Role of resonances in the electron-impact excitation functions of the C³Π_u and E³Σ_g⁺ states of N₂, Phys. Rev. A: Gen. Phys., 1974, 10, 2123. [all data]

Comer and Read, 1971
Comer, J.; Read, F.H., Electron impact studies of a resonant state of N₂^-, J. Phys. B:, 1971, 4, 1055. [all data]

Sanche and Schulz, 1972
Sanche, L.; Schulz, G.J., Electron transmission spectroscopy: core-excited resonances in diatomic molecules, Phys. Rev. A: Gen. Phys., 1972, 6, 69. [all data]

Mazeau, Gresteau, et al., 1973
Mazeau, J.; Gresteau, F.; Hall, R.I.; Joyez, G.; Reinhardt, J., Electron impact excitation of N₂. I. Resonant phenomena associated with the A³Σ_u⁺ and B³Π_g valence states, J. Phys. B:, 1973, 6, 862. [all data]

Brailsford, Morton, et al., 1969
Brailsford, J.R.; Morton, J.R.; Vannotti, L.E., Electron spin resonance spectrum of N₂^- trapped in KCl, KBr, and KI, J. Chem. Phys., 1969, 50, 1051. [all data]

Birtwistle and Herzenberg, 1971
Birtwistle, D.T.; Herzenberg, A., Vibrational excitation of N₂ by resonance scattering of electrons, J. Phys. B:, 1971, 4, 53. [all data]

Holzer, Murphy, et al., 1969
Holzer, W.; Murphy, W.F.; Bernstein, H.J., Raman spectra of negative molecular ions doped in alkali halide crystals, J. Mol. Spectrosc., 1969, 32, 13. [all data]

Hotop and Lineberger, 1975
Hotop, H.; Lineberger, W.C., Binding energies of atomic negative ions, J. Phys. Chem. Ref. Data, 1975, 4, 539. [all data]

Notes

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Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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