We present a pseudopotential calculation within the virtual crystal approximation of the energy band gaps and electron and heavyhole effective masses in zinc blende .GaP/1ô€€€x.ZnSe/x quasi-binary crystals. To make allowance for the compositional disorder, the Hamiltonian is described by a component due to the virtual crystal, and another component in which the disorder effects are included.In general, our results are in good agreement with the available experimental data to within a few per cent. The study showed that the calculated electronic quantities in .GaP/1-x.ZnSe/x are significantly different from those in the GaP and ZnSe parent compounds.

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