This is the first of two articles which together present a theory for translational and orientational single-particle correlation functions in molecular liquids. The theory is based on the assumption that the single-particle motion in a liquid is determined primarily by the harsh repulsive parts of the intermolecular forces. It is shown that the dynamics due to the repulsive forces can be related to the particle motion in a model rough hard sphere fluid. The dynamics of the model hard sphere system is studied…
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