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Vibrational predissociation of the 4pσ B″ levels of D2: an anomalous isotope effect

ABSTRACT The predissociation of the 4pσ B″ levels of D2 is investigated theoretically by both a multi-channel quantum defect theory and a two-level perturbation theory approach and discussed in comparison with experimental data. Whereas the B″ v'  ≥ 1 levels of H2 are known to rapidly predissociate through vibrational coupling with the 3pσ B′ continuum, these levels are observed to give rise to fluorescence in D2. The anomalous isotope effect is studied and discussed.