The second dielectric virial coefficient of non-ideal polar hard-sphere fluids and polar hard dumb-bell fluids

Abstract

The second dielectric virial coefficient, B _ϵ, of fluids is calculated for the two liquids: non-ideal polar hard-spheres (two point charges +q and -q are embedded in the hard-sphere); polar hard dumb-bells. B _ϵ depends sensitively on the shape of molecule. B _ϵ for the non-ideal polar hard-sphere fluids is a positive value, and increases with separation of two charges. On the other hand, B _ϵ for polar hard dumb-bell fluids decreases, becoming negative with the increasing length of the molecules. This behaviour agrees with the experimental results.