The Green function G c of an ideal crystal whose potential is treated in muffin‐tin approximation is investigated by means of the multiple scattering formalism. The evaluation of G c is possible by transforming the equation for G c corresponding to the transformation used in deriving energy‐independent H‐NFE‐TB schemes for band structure calculations from the KKR equation. G c is used for the investigation of electronic properties of localized defects representing a perturbation of the muffin‐tin potential at several lattice sites without lattice distortion. The wave function in the neighbourhood of the defect, the Friedel sum rule and the scattering properties of strongly localized defects are studied in detail.
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G. Lehmann (1975) studied this question.
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