Effect of electron correlation on the high-frequency conductivity of electron liquids on a liquid helium surface

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Abstract
The high-frequency conductivity of two-dimensional classical electron liquids on the surface of liquid helium is calculated in the domain of intermediate and strong coupling by making use of the dynamic form factor obtained by recent numerical experiments. It is shown that the effect of correlations between electrons is small and the high-frequency conductivity is almost identical to the one given by the Boltzmann-equation approach even in the domain of strong coupling.