Analytical results for the structure factor of a two-component model plasma that describe an electron-ion plasma with modified interaction are derived from a Green function approach in different approximations. The random-phase approximation is improved by including the dynamic collision frequency, and results for the long-wavelength limit are extended to arbitrary wave numbers using the Mermin ansatz. After taking the classical limit of the resulting expressions, they are compared with molecular dynamics simulation results for the classical two-component model plasma.

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The dynamic structure factor of one-component plasmas at moderate coupling (Γ=0.5–8) is studied analytically and by molecular dynamics simulations. The recurrence relation technique is used to derive a parameterization of the dynamic structure factor taking into account analytically accessible moments. These moments are calculated from the pair distribution function obtained within the hypernetted chain approximation. A truncation of the recurrence relations on the level of the second-order memory function is proposed. It is shown, that this presents an efficient way to incorporate collisions.

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The dynamic structure factor of a two-component model plasma, where the Coulomb interaction is regularized at short distances, is investigated in molecular dynamics simulation studies. Special attention is paid to the dependency of the dynamic response on a variation of the used effective interaction and a test of the accuracy of the predictions made by diverse theoretical treatments.