Statistical thermodynamics of interaction-site molecules

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Abstract
A theoretical study of the statistical mechanical description of a system composed of interaction-site molecules is made using the site-site correlation function approach. The system of hard dumb-bells is then studied in detail. The problem of excluded volume of a pair of spheres embedded in the dumb-bells is solved, which enables one to evaluate the second virial coefficient and to derive an approximate equation of state in a closed analytical form. The equation of state obtained shows good agreement with Monte Carlo data.

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