Effect of Surface Roughness on the Photodissociation Threshold of Chlorobenzene and 3-Chloropyridine Adsorbed on Silver

Article abstract of DOI:10.1021/j100076a001

We have investigated the photodissociation of chlorobenzene and 3-chloropyridine adsorbed on smooth and rough Ag surfaces.Photolysis of adsorbed chlorobenzene and 3-chloropyridine with UV radiation results in C-Cl bond dissociation.Biphenyl and bipyridyl desorb from the surface near 400 K, and AgCl desorbs near 800 K in postirradiation temperature-programmed desorption.Compared to a smooth surface, there is a red shift in the photodissociation threshold for both molecules when adsorbed on a rough surface.Possible mechanisms for the red shift are discussed.This study demonstrates the importance of substrate morphology on surface photochemistry.