Abstract
Recently, Abascal and co-workers have developed an extended perturbation theory for diatomic liquids which combines the Weeks–Chandler–Andersen choice of reference potential with the Barker–Henderson choice of hard sphere diameter. Here we report results for the case of atomic liquids. This theory is shown to work well for atomic liquids at moderate densities, for ρ*<0.75. At higher densities, this theory is less accurate than the first order Barker–Henderson theory. Implications for perturbation theories involving molecular liquids are discussed.
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