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The longitudinal wave-vector-dependent dielectric function (q) is calculated for Si, Ge, GaAs, and ZnSe. The energy eigenvalues and wave functions which are used have been obtained from energy-band calculations based on the empirical pseudopotential method. Explicit results are given in the 1, 0, 0, 1, 1, 0, and 1, 1, 1 directions in the range 0 (4a). A comparison is made between the present results and the results of other calculations. Some comparisons with experiment are also made.
Walter et al. (Tue,) studied this question.