Abstract
Deviations from ideality in the adlayer are discussed in terms of a Bragg-Williams monolayer model with empty sites. Equations for equilibrium and nonequilibrium surface concentrations of growth units are derived together with an equation for the variation of surface diffusion coefficient with surface supersaturation. A generalized form of the BCF differential equation for surface diffusion is established, and curves of crystal growth rate as a function of supersaturation are calculated from the results of numerical integration of this equation. It is shown that the BCF theory involves rather crude approximations, but the growth curves obtained from the more realistic model do not deviate very much from the BCF growth curve.
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