Radiative lifetimes of rovibrational levels of the BH A1Π state

Abstract

Radiative lifetimes of the rovibrational levels of the A 1Π excited electronic state of BH have been calculated. These calculations use the hybrid potential energy curves of the X 1Σ + state of W. T. Luh and W. C. Stwalley [ J. Mol. Spectrosc. 102, 212 (1983)] and the A 1Π state of O. Gustafsson and M. Rittby [ J. Mol. Spectrosc. 131, 325 (1988)] of the BH molecule and the recent ab initio transition moment functions of G. H. G. Diercksen et al. [ Chem. Phys. 115, 15 (1987)] and G.E. Scuseria et al. [ J. Chem. Phys. 90, 2338 (1989)]. The calculated radiative lifetimes for the low J′ rotational levels of the v′ = 0, 1, 2 vibrational levels are in excellent agreement with the laser-induced fluorescence results of C. H. Douglass et al. [ J. Chem. Phys. 90, 6940 (1989)]. The rotational dependence of the lifetimes observed by Gustafsson and Rittby using the modulation technique is also confirmed. The effect of the A 1Π potential barrier height on the radiative lifetime of quasibound levels is also examined.