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Coulomb collisions, at appreciable ratios (\eta) of the electron to theneutral particle density, influence significantly the electron kinetics inparticle swarms and in plasmas of gas discharges. This paper introduces acombination of Molecular Dynamics and Monte Carlo simulation techniques, toprovide a novel, approximation free, first principles calculation method forthe velocity distribution function of electrons, and related swarmcharacteristics, at arbitrary \eta. Simulation results are presented forelectrons in argon gas, for density ratios between zero and 0.1, representingthe limits of a negligible electron density and an almost completeMaxwellization of the velocity distribution function, respectively.

First principles calculation of the effect of Coulomb collisions in partially ionized gases