Evaluation of the CPY and PYX approximations for short ranged anisotropic potentials

Abstract

In the first paper in this series, a new integral equation approximation-the Percus-Yevick excess (PYX) approximation-was introduced and contrasted with the corrected Percus-Yevick (CPY) approximation. In the present paper, these two approximations are evaluated for a molecular fluid, the molecules of which interact via a short ranged anisotropic potential prototypical of the overlap interactions encountered between homonuclear diatomic molecules. We conclude that the CPY and PYX approximations are quite accurate; interestingly, however, they unexpectedly yield very similar results leading us to conclude that, on balance, both approximations are equally good.

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Notes on contributors

J. Ram

On leave from: Physics Department, Banaras Hindu University, Varanasi 221005, India.