Abstract
The potential energy
function for interaction of two argon atoms is determined as closely as
possible by fitting a multiparameter potential
function to experimental data on molecular beam scattering and second virial
coefficients, and to the known long-range interaction coefficients. These data
are consistent with a range of potential functions between which gas transport
properties do not enable a clear choice to be made. In particular, gas
viscosities calculated with any of the potential functions show deviations from
experiment which are tentatively ascribed to unexpectedly large slip in the
viscosity measurements. Third virial coefficients calculated with allowance for
the triple-dipole dispersion three-body interaction are close to experimental
values whichever function is used, suggesting that other non-additive
interactions must be small. Assuming this, the properties of crystalline argon at
0�K are used to specify a single potential function.
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