Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Y6.
Phys. Rev. A 45, 3659-3669 (1992)
Abstract
The hypernetted-chain closure is modified to
include three-body potentials. The latter is reduced to a
state-dependent effective pair potential. Explicit expressions for the
Helmholtz free energy and for the chemical potential are derived for the
modified closure. The approximation is shown to be relatively
self-consistent and in qualitative agreement with perturbation results.
An argonlike fluid is discussed using the Lennard-Jones pair potential
and the Axilrod-Teller triple-dipole potential. In agreement with
earlier work, it is found that the effective three-body contribution is
positive, increasing the pressure and the internal energy by about 10%
in the liquid state.
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