Radiative and predissociative lifetimes of the V′=0 level of the A 2Σ+ state of SH and SD from chemical and spectroscopic studies

Abstract

Predissociation is observed to occur throughout the V′=0 level of the A 2Σ+ states of SH and SD, based upon laser‐induced fluorescence measurements obtained in conjunction with knowledge of the absolute concentrations of both radicals via chemical titration in a fast flow reactor in the pressure range 1–5 Torr. By comparison of results with those obtained in the same system for OH, a radical for which both the kinetics and spectroscopy are well defined, predissociative and radiative lifetimes are calculated to be 3 and 820 ns for SH; 260 and 730 ns for SD.