Abstract
Advances made in the study of the diffusion of adsorbed species on single crystal surfaces are summarized. An appraisal of the techniques and methods of data treatment which have been developed for both macroscopic (single crystals cut to expose a given crystal plane) and microscopic (field emitter) surfaces is presented, and a brief survey is made of the data obtained for precursor, molecularly chemisorbed, and dissociatively chemisorbed states. The influence of lateral interactions between adatoms on diffusion parameters is explicitly examined in relation to recent results for O adatoms on W{110}. Finally, a brief survey is given of the importance of diffusion in other surfaces processes, such as the formation of ordered overlayers and adsorption and desorption kinetics.
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