Observing perturbations in the relative spontaneous emission probabilities from the rovibronic levels of the triplet 3s, 3d complex of H{sub 2} and D{sub 2} terms
Journal Article
·
· Optics and Spectroscopy
OSTI ID:105426
- St. Petersburg Univ. (Russian Federation)
The relative spontaneous emission probabilities of pairs of spectral lines having a common upper rovibronic level but belonging to different P, Q, and R branches within the same band of electronic (3s{sigma}){sup 3}{Sigma}{sub g}{sup +}, (3d{sigma}){sup 3}{Sigma}{sub g}{sup +}, (3d{pi}){sup 3}{Pi}{sub g}{sup {+-}} {yields} (2p{pi})c{sup 3}{Pi}{sub u}{sup {+-}} transitions of the H{sub 2} and D{sub 2} isotopes of the hydrogen molecule have been measured for the first time. Large differences (reaching a factor of 20) of the experimental results from the predictions of adiabatic theory are detected not only when the Hoenl-London formulas are used but also when the vibrational-rotational interaction is included in the Franck-Condon factors. It is shown that the nonadiabatic electronic-rotational interaction, which was studied earlier only by analyzing the position of the lines in the spectrum and the velocity spectra of the atoms generated in laser-stimulated dissociation, results in significant perturbations in the radiative transition probabilities. The resulting data open up new possibilities for semiempirically determining the electronic transition moments from the levels of the triplet 3s, 3d term complex to the stable c{sup 3}{Pi}{sub u} and unbound b{sup 3}{Sigma}{sub u}{sup +} states of the hydrogen molecule. 35 refs., 5 figs.
- OSTI ID:
- 105426
- Journal Information:
- Optics and Spectroscopy, Journal Name: Optics and Spectroscopy Journal Issue: 6 Vol. 75; ISSN 0030-400X; ISSN OPSUA3
- Country of Publication:
- United States
- Language:
- English
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