Abstract
We use a path-integral Monte Carlo method together with state-of-the-art pair and three-body potentials to calculate the third virial coefficient C(T) of para-hydrogen in the temperature range 30–2000K. Our results point out that non-additive three-body interactions have a sizable effect in determining the value of C(T) for T<200K. Although a good agreement with experimental data is obtained, the accuracy of the calculations is limited by the incomplete knowledge of the three-body potential energy surface.
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