Abstract
Chemical interactions between gas molecules and solid surfaces manifest themselves as crucial considerations in such diverse areas as wall effects in fusion reactors, heterogeneous catalysis (including electrocatalysis), corrosion, and molecular cos mology. In each of these fields the resolution of important questions rests on a more fundamental understanding of molecular transformations that occur at solid surfaces. Each process in question is characterizcd by thc sequence of molecular events (a) adsorption, (b) surface reaction, and (c) desorption (except when the reac tion product is nonvolatile). The purpose of this article is to review the recent work that utilizes single-crystal surfaces to understand these elementary processes, in cluding the effects of surface structure and composition. Excellent review articles are available concerning adsorption-desorption and surface reaction phenomena (82, 106, 108, 118, 141) and the interested reader should consult these for further information. In addition to these kinetic events, the current knowledge of the nature of the adsorbed state is also briefly reviewed. Surface oxidation processes which involve the surface as a final reaction product are not discussed.
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