Absolute Fluorescence Yields from Electron Irradiated Gases: XeBr*

Abstract

The techniques of pulse radiolysis and emission spectroscopy have been used to determine absolute total emission yields for the XeBr* exciplex. By application of known formation and quenching rate constants and mechanisms, individual fluorescence yields have been determined for the unquenched three-body ionic recombination reaction, Xe2+ + Br- + Xe → XeBr* + 2Xe, Go+ = 3.40 ± 0.18, and for the reaction of electronically excited xenon atoms with CF3Br, Xe* + CF3Br → XeBr* + CF3, Go* = 0.68 ± 0.10. These experimental yields are compared to the predictions of current theoretical models, which allow calculation of the efficiency for each ion-pair recombination event and excited state reaction to give the fluorescent XeBr* exciplex as 75% and 36%, respectively.