Equilibrium theory of a semiclassical fluid of nonanalytic potential: Application to the Yukawa-tail fluid

Abstract

Using the quantum-mechanical hard-sphere system as a reference system and the attractive interaction as a perturbation, we present computationally convenient theoretical methods for calculating the structural and thermodynamic properties of a fluid in the semiclassical limit. This approach is based on the assumption that, for a dense fluid, the quantum effects are largely determined by the repulsion due to the hard core and the attractive interactions play a minor role. The exponential approximation for the radial distribution function and "(optimized random-phase approximation) + ${B}_{2}$" for the excess Helmholtz free energy have been applied to calculate the structural and thermodynamic properties of the Yukawa-tail fluid in the semiclassical limit.