## Abstract

A semiempirical analysis is performed of data on electronic vibration-rotation (EVR) levels of mutually perturbed i^{3}Π^{-} and j^{3}Δ^{-} states and relative spontaneous emission probabilities for transitions from these states to the c^{3}Π_{u} state in H_{2}
^{g} and D_{2} molecules. The expansion coefficients for the perturbed wave functions in the Born-Oppenheimer basis for the H_{2}, HD, and D_{2} molecules are obtained. Analysis of the isotope effect in the line strength ratios for various branches of the i^{3}Π_{g}
^{-}→c^{3}Π_{u} and j^{3}Δ_{g}→c^{3}Π_{u} transitions showed that: (1) experimental data (76 values) are adequately described in the framework of the proposed nonadiabatic model with the help of a single variable parameter, namely, the ratio of the electronic dipole moments for these transitions, M_{jc}/M_{ic} = -1.35±0.05; (2) the dependence of the above parameter on the internuclear distance r can be neglected in the range r = 1.5-3.0 a.u.; (3) the electron-rotation coupling of the b^{3}Σ_{u}
^{+} and c^{3}Π_{u}
^{+} states is not essential at 10% accuracy of the relative line strength measurements. The obtained M_{jc}/M_{ic} value agrees well with that determined by laser photofragmentation spectroscopy and differs by 20-30% from the ab initio value.

Original language | English |
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Pages (from-to) | 38-47 |

Number of pages | 10 |

Journal | Optics and Spectroscopy (English translation of Optika i Spektroskopiya) |

Volume | 76 |

Issue number | 1 |

State | Published - 1 Jan 1994 |

## Scopus subject areas

- Spectroscopy
- Atomic and Molecular Physics, and Optics