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A calculation for the wavenumber-dependent dielectric function has been made using a model originally proposed by Fry, without any further simplification. We have compared our numerical results with the ones obtained by Fry for KCl and argon and the agreement is very good. Comparison is also made with the results obtained using different models. In this case, the agreement is not as good as in the previous case.
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N. O. Lipari (1970) studied this question.
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