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We present a new approach for the calculation of the dielectric response functions for various strongly coupled Coulomb systems, whose main common feature is that the charges are quasilocalized. Such a model is expected to be a valid description of a strongly coupled plasma in the 1 limit. The dielectric function (k) and the longitudinal plasmon dispersion (k) appear as functionals of the equilibrium pair-correlation functions. We derive the longitudinal-plasmon dispersions for arbitrary k values for the three- and two-dimensional one-component plasmas; both of them saturate after an oscillatory behavior substantially below their random-phase approximation value for large k values. In two-component systems correlational effects bring about marked upward and downward shifts in the plasma frequency (k=0). We find good agreement with molecular-dynamics data for H^+-H^2+ mixtures and predict a more significant shift for H^+--high-Z mixtures.
Kalman et al. (Tue,) studied this question.