# Nitrogen anion

**Formula:**N_{2}^{-}**Molecular weight:**28.0139**CAS Registry Number:**12185-02-3**Information on this page:****Options:**

## Gas phase thermochemistry data

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Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|

S°_{gas,1 bar} | 204.54 | J/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1977 |

## Constants of diatomic molecules

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

Data collected through May, 1976

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_{e}x_{e} | vibrational constant – second term (cm^{-1}) |

ω_{e}y_{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 |

ν_{00} | position of 0-0 band (units noted in table) |

State | T_{e} | _{e} | _{e}x_{e} | _{e}y_{e} | B_{e} | _{e} | _{e} | D_{e} | _{e} | r_{e} | Trans. | _{00} |
---|---|---|---|---|---|---|---|---|---|---|---|---|

Theoretical calculations of N_{2}^{-} states Thulstrup and Andersen, 1975. | ||||||||||||

Additional resonances in electron scattering at higher energies,
several of them assiciated with the lowest N_{2} Rydberg states which derive
from A ^{2}_{u} of N_{2}^{+}. | ||||||||||||

↳Mazeau, Hall, et al., 1973; Schulz, 1973; Golden, Burns, et al., 1974 | ||||||||||||

E ^{2}_{g}^{+} | (77150) 1 | (2180) 1 | (16) 1 | 1.11_{5} 1 | ||||||||

↳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 ^{1}_{g}^{+} (v=0) of N_{2}.
They correspond to negative ion formation with subsequent decay to
A ^{3}_{u}^{+} and B ^{3}_{g}, respectively, of neutral N_{2}. | ||||||||||||

↳Sanche and Schulz, 1972; Mazeau, Gresteau, et al., 1973; Schulz, 1973 | ||||||||||||

State | T_{e} | _{e} | _{e}x_{e} | _{e}y_{e} | B_{e} | _{e} | _{e} | D_{e} | _{e} | r_{e} | Trans. | _{00} |

X ^{2}_{g} | 0d | (1968) 2 3 | (10) 2 | 1.19_{3} 2 | ||||||||

↳Brailsford, Morton, et al., 1969 |

### Notes

1 | 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 ^{1}_{g}^{+}(v=0) of N_{2}. The parent is the E ^{3}_{g}^{+}
Rydberg state of N_{2}, the grandparent X ^{2}_{g}^{+}(v=0) of N_{2}^{+}. |

2 | Ground state constants derived by Birtwistle and Herzenberg, 1971 from a comparison of experimental with
calculated cross sections for the vibrational excitation of N_{2}
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 decreases rapidly with increasing r from 0.57 eV at
r_{e}(N_{2}). |

3 | Holzer, Murphy, et al., 1969 observe G(1/2) ~ 1840 Holzer, Murphy, et al., 1969 for N_{2}^{-} in potassium halide single crystals. |

4 | From D_{0}^{0}(N_{2}) and the e1ectron affinities of N_{2} and
N, assuming for the latter -0.07 eV as given by Hotop and Lineberger, 1975. |

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

6 | The minimum of the ground state potential function lies
1.92_{5} eV above that of N_{2} Birtwistle and Herzenberg, 1971; see 2. |

7 | Spectrum of N_{2}- in potassium halides, confirming the ^{2} nature of the ground
state. |

## References

**Go To:** Top, Gas phase thermochemistry data, Constants of diatomic molecules, Notes

**Chase, 1998**

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

**Thulstrup and Andersen, 1975**

Thulstrup, E.W.; Andersen, A.,
*Configuration interaction studies of bound, low-lying states of N _{2}^{-}, N_{2}, N_{2}^{+} and N_{2}^{2+}*,

**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 N _{2}. 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 C ^{3}«PI»_{u} and E^{3}«SIGMA»_{g}^{+} states of N_{2}*,

**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 N _{2}^{-}*,

**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 N _{2}. I. Resonant phenomena associated with the A^{3}«SIGMA»_{u}^{+} and B^{3}«PI»_{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 N _{2}^{-} 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 N _{2} 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

**Go To:** Top, Gas phase thermochemistry data, Constants of diatomic molecules, References

- Symbols used in this document:

S° _{gas,1 bar}Entropy of gas at standard conditions (1 bar) - Data from NIST Standard Reference Database 69:
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