Experimental and Theoretical Studies of OD A²Σ⁺State Lifetimes and Predissociations

Lifetimes of 160 different spin-splitted rotational levels of the OD A 2 Σ + state (ν = 0-3) have been measured at high spectral resolution using the High Frequency Deflection technique. From these data the variation of the electronic transition moment is deduced as well as the predissociation rates for levels above the dissociation limit. These rates are compared to calculated ones based upon spin-orbit coupling between the crossing 2 Σ + and 4 Σ - states. From a least square fit to the predissociation rates a potential crossing point slightly above ν = 5 of the A state at r = 1.50 ± 0.02 Å, and a spin-orbit coupling element H so = 36 ± 18 cm -1 are found.