Abstract
In non-ideal plasmas, the dielectric function has to be treated beyond the random phase approximation. Correlations as well as collisions have to be included. These corrections are known as (dynamical) local field corrections. Based on the Zubarev approach to linear response theory, a relaxation time approximation is proposed leading to an interpolation scheme between static local field corrections and the Drude model in the long-wavelength limit. The approach generalizes the Mermin approximation for the dielectric function and allows for the inclusion of a dynamical collision frequency. A numerical illustration is given for a classical two-component plasma at intermediate coupling.
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