Abstract
An extended perturbation theory of IV and III-V covalent semiconductors based on a model pseudopotential method is presented. In the theory, in addition to the usual second order perturbation, higher order terms with respect to pseudopotential corresponding to the covalent bonding effect are taken into account under the so-called isotropic energy gap model. The theory is applied to calculation of cohesive energies and compressibilities of these crystals. A good agreement between the theory and experiment is obtained.
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