Direct Monte Carlo sampling of the short-range screening potentials for classical Coulomb liquids

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Abstract
A Monte Carlo (MC) simulation scheme to sample directly the screening potentials for Coulomb liquids at short interparticle distances is formulated on the basis of the importance sampling techniques. It is applied to the one-component plasmas at various degrees of the Coulomb coupling to obtain the screening potentials with high accuracy; a fitting formula for the MC values of the potentials is presented. The results for the screening potentials at zero separation are compared with those obtained in various approximation methods, and are utilized for the analyses of the excess free energy for binary-ionic-mixture plasmas through a thermodynamic self-consistency equation with respect to the screening potentials. © 1996 The American Physical Society.