The wave-number-dependent dielectric function is calculated for crystalline KCl, on the basis of the expressions derived in a previous paper. The value, 2.383, is obtained for the static dielectric constant in long wave length limit, which is to be compared with the observed optical dielectric constant ε ∞ =2.13. The contribution from the Umklapp terms has turned out to be rather small. An approximate analytical expression is presented for the screened Coulomb potential in KCl crystal.
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Masayoshi Azuma (1964) studied this question.
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