Predissociation in the B {sup 1}{pi}{sub u} state of {sup 6}Li{sup 7}Li: Accidental perturbations beyond the ungerade-gerade symmetry breaking
Journal Article
·
· Physical Review. A
- Laboratoire PhLAM, Universite de Lille 1, 59655 Villeneuve d'Ascq Cedex (France)
Recently, an unusual predissociation was observed for some vibrational levels of the B {sup 1}{pi}{sub u} molecular state of {sup 6}Li{sup 7}Li [Bouloufa et al., Phys. Rev. A 63, 042507 (2001)]. It was interpreted as due to the ungerade-gerade symmetry breaking that couples the B {sup 1}{pi}{sub u} quasibound levels to the 1 {sup 1}{pi}{sub g} continuum. However, the agreement between theory and experiment was not perfect for predissociation rates of three rovibrational levels, occurring for isolated quantum numbers. Here, we identify these additional perturbations as due to the rotational coupling of the 1 {sup 1}{pi}{sub g} continuum with quasibound levels of the 2 {sup 1}{sigma}{sub g}{sup +} state. In addition, our method allows a calculation of the {lambda}-doubling in the 1 {sup 1}{pi}{sub g} state and dissociation rates of quasibound 2 {sup 1}{sigma}{sub g}{sup +} levels for three isotopomers of Li{sub 2}. Comparison with experimental data is discussed.
- OSTI ID:
- 20640324
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 68; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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