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, Xe-2(+) + Br- + Xe --> XeBr* + 2Xe, G(0)(+) = 3.40 +/- 0.18, and for the reaction of electronically excited xenon atoms with CF3Br, Xe* + CF3Br --> XeBr* + CF3, G(0)* = 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.