A method of calculating the pair distribution function in semiconductor alloys has been extended to the differential and the partial pair distribution functions, and applied to pseudobinaries of the form A 1Ϫx B x C with the zinc-blende structure. We have used a simple valence force model with bond-stretching and bond-bending forces. Results of calculations are presented for Ga 0.5 In 0.5 As. The differential pair distribution function provides a useful experimental way of determining the

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... ural distortions in semiconductor alloys-specifically the mean nearest-neighbor and second-neighbor distances and widths can be obtained for chemically specific pairs of atoms. ͓S0163-1829͑99͒00407-5͔