We compute by means of quantum Monte Carlo simulations the equation of state of bulk solid para-hydrogen extrapolated to zero temperature, up to a pressure of ~2 Mbar. We compare the equation of state yielded by three different pair potentials, namely, the Silvera-Goldman (SG), Buck, and one recently proposed by Moraldi, modified at short distances to include a repulsive core, missing in the originally proposed potential. The Moraldi pair potential yields an equation of state in very good agreement with experiment at megabar pressures, owing to its softer core, and is at least as accurate as the SG or the Buck at saturated vapor pressure. Estimates for the experimentally measurable kinetic energy per molecule are provided for all pair potentials.
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Omiyinka et al. (2013) studied this question.
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