# T2+

**Formula:**T_{2}^{+}**Molecular weight:**6.0315499755**Information on this page:****Options:**

## Constants of diatomic molecules

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**
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 November, 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} |
---|---|---|---|---|---|---|---|---|---|---|---|---|

X ^{2}_{g}^{+} | 0 | 1336 1 | 22 1 | 10.014 1 | 0.294 1 | 0.0023 1 | 1.0566 |

### Notes

1 | Extrapolated Cunningham and Dieke, 1950 from low members of the Rydberg series np^{3}(n=2.. .5) of T_{2}. |

2 | From D_{0}^{0}(D_{2}) and I.P.(D_{2}); theoretical value D_{00}= 2.69192 eV Bishop, 1974. |

3 | Data for these two states are entirely theoretical Kroll, 1970. |

4 | G(3/2) = 1512.1; from Rydberg series of D_{2} Takezawa and Tanaka, 1975. Corresponding theoretical
values 1577.15, 1512.47 [adiabatic approximation Hunter, Yau, et al., 1974]. Higher vibrational levels
[observed in photoionization Villarejo, 1968 and photoelectron Spohr and Puttkamer, 1967 spectra] and rotational levels,
including quasi-bound levels, calculated by Hunter and Pritchard, 1967, Hunter, Yau, et al., 1974. Franck-Condon factors for
photoionization of D_{2} from X ^{1}_{g}^{+} calculated by Halmann and Laulicht, 1965, Dunn, 1966 and measured by Spohr and Puttkamer, 1967, Villarejo, 1968. |

5 | Extrapo1ated Cunningham and Dieke, 1950 from low members of the Rydberg series np^{3}(n=2.. .6) of D_{2}.
See also 4. |

6 | Theoretical value Bishop, 1976. |

7 | Calculated from the Born-Oppenheimer potential function and the adiabatic
corrections (scaled down for T_{2}^{+}) given by Bishop and Wetmore, 1973. |

## References

**Go To:** Top, 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.
**

**Cunningham and Dieke, 1950**

Cunningham; Dieke,
**Johns Hopkins University, Department of Physics**, Rpt. NYO-692, 1950, 1. [all data]

**Bishop, 1974**

Bishop, D.M.,
*Non-adiabatic calculations for H _{2}^{+}, HD^{+} and D_{2}^{+}*,

**Mol. Phys.**, 1974, 28, 1397. [all data]

**Kroll, 1970**

Kroll, M.,
*A prediction of the discrete electronic transition 2p«pi» _{u}-3d«sigma»_{g} of H_{2}^{+}*,

**J. Mol. Spectrosc.**, 1970, 35, 436. [all data]

**Takezawa and Tanaka, 1975**

Takezawa, S.; Tanaka, Y.,
*The absorption spectrum of D _{2} in the vacuum-uv region, Rydberg bands, no_{«sigma»}^{1}«SIGMA»_{u}^{+}<--X^{1}«SIGMA»_{g}^{+} and np_{«pi»}^{1}«pi»<--X^{1}«SIGMA»_{g}^{+} with n=4-6, and the ionization energy*,

**J. Mol. Spectrosc.**, 1975, 54, 379. [all data]

**Hunter, Yau, et al., 1974**

Hunter, G.; Yau, A.W.; Pritchard, H.O.,
*Rotation-vibration level energies of the hydrogen and deuterium molecule-ions*,
**At. Data Nucl. Data Tables**, 1974, 14, 11. [all data]

**Villarejo, 1968**

Villarejo, D.,
*Measurement of threshold electrons in the photoionization of H _{2} and D_{2}*,

**J. Chem. Phys.**, 1968, 48, 4014. [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]

**Hunter and Pritchard, 1967**

Hunter, G.; Pritchard, H.O.,
*Born-Oppenheimer separation for three-particle systems. III. Applications*,
**J. Chem. Phys.**, 1967, 46, 2153. [all data]

**Halmann and Laulicht, 1965**

Halmann, M.; Laulicht, I.,
*Isotope effects on vibrational transition probabilities. III. Ionization of isotopic H _{2}, N_{2},,O_{2}, NO, CO, and HCl molecules*,

**J. Chem. Phys.**, 1965, 43, 1503. [all data]

**Dunn, 1966**

Dunn, G.H.,
*Franck-Condon factors for the ionization of H _{2} and D_{2}*,

**J. Chem. Phys.**, 1966, 44, 2592. [all data]

**Bishop, 1976**

Bishop, D.M.,
*Accurate calculation of the infrared spectra of HD ^{+}, HT^{+}, and DT^{+}*,

**Phys. Rev. Lett.**, 1976, 37, 8, 484-485. [all data]

**Bishop and Wetmore, 1973**

Bishop, D.M.; Wetmore, R.W.,
*Vibrational spacings for H _{2}^{+}, D_{2}^{+} and H_{2}*,

**Mol. Phys.**, 1973, 26, 145. [all data]

## Notes

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- Data from NIST Standard Reference Database 69:
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