Abstract
Two recent theories for the two particle distribution function of polar fluids are compared. The formal theory of Nienhuis and Deutch [J. Chem. Phys. 55, 4213 (1971)] is valid for arbitrary sample geometry and arbitrary short-range forces accompanying the dipole-dipole interactions. The theory of M. S. Wertheim [J. Chem. Phys. 55, 4291 (1971)] presents an exact result for the mean spherical model (MSM) of a fluid of hard spheres with embedded dipole moment in an infinite system and in a finite spherical system. Perfect agreement is found when the approximations of the MSM are introduced into the Nienhuis-Deutch theory. This lends strong support to the conclusions that have been drawn about the long-range and shape dependent nature of the two particle distribution function for polar systems. Finally an expression is given for the excess free energy of a dipolar fluid in the MSM.
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