Binary collisions in fluids: I: single particle density correlation function

Abstract

Binary collision expansion is applied to the space–time memory function associated with the single particle density correlation function. The use of the potential of mean force as the interaction potential in the determination of two particle dynamics, thus taking into account the structural correlations of the fluid, is found to yield significantly improved results for the correlation function. Comparison of our results with molecular dynamics and experimental values shows very good agreement over a wide range of densities and wave vectors.