Excimer laser light is used to photodissociate hydrogen halides and halogens weakly adsorbed on two contrasting surfaces, lithium fluoride and silver. The dissociation proceeds via a direct repulsive excited electronic state in times of the order of 10−14 sec. The angular and velocity distributions of the hydrogen and halide fragments ejected directly off the surface are measured with time-resolved line-of-sight mass spectrometry. Comparisons of the results from these two surfaces with the gas phase photolysis give direct information on the dynamics of the surface laser photolysis and the competition with molecule-surface electronic quenching.

© 1984 Optical Society of America

PDF Article