A treatment of collision-induced relaxation of electronically excited molecules in gases which accounts for translational cooling of the subensemble of excited molecules. Application to benzene and hexafluorobenzene

Abstract

We extend our previous statistical treatment of the pressure dependence of the fluorescence quantum yield of benzene and hexafluorobenzene to include the change in velocity of an excited molecule upon collision with a buffer gas molecule. The velocity change has a negligible effect on the fluorescence quantum yield of benzene and hexafluorobenzene, but may be noticeable in other instances.