Radiative lifetime and multiquantum vibrational relaxation of SO(B 3Σ −, v′ = 3) by collisions with He

Abstract

The time profiles of fluorescence from a single vibrational level of SO(B 3Σ −, v′ = 3) were recorded at various He pressures. The radiative lifetime, 29 ± 4 ns determined by a deconvolution analysis, is nearly identical with those of v′ < 3. The rate coefficients for single-quantum relaxation, Δ v = 1, and multiquantum relaxation Δ v = 2 and 3, have been obtained from the He pressure dependence of dispersed fluorescence spectra. The Franck–Condon factors for v′ = 3 → v″ = 0–23 in the B 3Σ −–X 3Σ − system have also been determined.