Abstract
The effect of surface reconstruction on the kinetics of absorption and desorption is analyzed in the framework of a phenomenological model based on the following assumptions. The activation energy for adsorption on the perfect unreconstructed surface is so high that at the beginning the sticking occurs only near defect sites. This process is accompanied by a restructuring of the adjacent sites. The latter in turn facilitates further adsorption. If defect sites are arranged on the surface at random, the adsorption kinetics is described by the Avrami equations and the desorption kinetics is of first order. If the sticking occurs near step sites, the kinetics of adsorption and desorption may be of zeroth order.
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