Lifetimes and predissociation mechanisms of O+2bthinsp;4Sgr;gminus;(v= 5ndash;8)

摘要

Predissociation linewidths (lifetimes) of the O+2bthinsp;4Sgr;minus;gstate have been measured as a function of both rotational levelsNand spinhyphen;orbit fine structure componentsF1,F2,F3, andF4for vibrational levels 5 through 8. The lifetime variation is inconsistent with predissociation by either thedthinsp;4Sgr;+gstate or thefthinsp;4Pgr;gstate alone, but can be explained by assuming both states participate in the dissociation. Analysis of the linewidth variation, using an experimentally determinedfthinsp;4Pgr;gpotential curve, allows a separation of the effects of the4Sgr;+gand4Pgr;gstates on the predissociation. The experimental linewidths are compared with theoretical calculations and found to be about a factor of 3 larger than calculated. Relative transition moments from theastate to thedandfstates are estimated using a single configuration interaction calculation.