# Nitrogen anion

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

## Gas phase thermochemistry data

**Go To:** Top, Constants of diatomic molecules, References, Notes

**
Data compilation copyright
by the U.S. Secretary of Commerce on behalf of the U.S.A.
All rights reserved.
**

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

**Go To:** Top, Gas phase thermochemistry data, References, Notes

**
Data compilation copyright
by the U.S. Secretary of Commerce on behalf of the U.S.A.
All rights reserved.
**

**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

**
Data compilation copyright
by the U.S. Secretary of Commerce on behalf of the U.S.A.
All rights reserved.
**

**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:
*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.