The autocorrelation function for the electric field at an impurity ion in a plasma is considered. A simple model is constructed that preserves the exact short time dynamics and the long time global constraint of a given self-diffusion coefficient. The input required is the initial value of the autocorrelation function and its derivatives, and the self-diffusion coefficient. These are calculated from the hypernetted chain equations for correlation functions and a ''disconnected'' approximation for the self-diffusion coefficient. A comparison of the predictions of the model for the electric field autocorrelation function with results from molecular dynamics simulation shows good agreement over a wide range of plasma coupling, impurity ion charge, and impurity ion mass. This provides justification for a simple interpretation of electric field dynamics in terms of three collective modes.
High frequency electrical conductivity is studied in the case of a strongly coupled quasiclassical plasma. Analytic results are derived both from the memory function formalism and the linear response theory developed earlier. The results obtained are compared with computer simulation data. Collective effects are shown to play an important rqle in optical properties of collision dominated plasmas.
The skin depth and the Fresnel reflectivity are evaluated in the case of strongly coupled plasmas. Analysis is based on the explicit expression for the dynamic collision frequency. Peculiarities of electromagnetic wave penetration into collision-dominated plasmas and reflectivity in the vicinity of critical density are considered.
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