EVIDENCE FOR A CAGE EFFECT IN THE UV PHOTOLYSIS OF HBR IN AR-HBR - THEORETICAL AND EXPERIMENTAL RESULTS

Evidence for a cage effect in the 193 nm photodissociation of HBr in t he Ar-HBr cluster is found. This effect manifests itself as a tail ext ending toward lower energies in the hydrogen photofragment kinetic ene rgy distribution (KED). This is a consequence of energy transfer in co llisions between the light and the heavy atoms. There is good agreemen t between the experimental and theoretical KEDs.