Studies in statistical mechanics of Coulombic systems. IV. The screened-Coulomb charged hard sphere system and its relation to the restricted primitive model

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Abstract
Monte Carlo results are reported for three liquid states of a model consisting of two species (anions and cations) of charged hard spheres of equal diameter, which interact with a screened Coulomb potential. Results of the mean spherical approximation, the truncated Γ2 approximation, and the EXP approximation are compared with the MC results. Numerical and theoretical relationships between this model and the restricted primitive model (RPM) are established. The effect of the methodological errors involved in MC simulations of the RPM is studied by comparing the MC radial distribution functions (rdf’s) for the RPM with the rdf’s obtained from a perturbation theory, using the screened Coulomb system as the reference system.