Calculation of thermodynamic quantities of inert-gas fluids by means of theRHNCand modern pair potentials

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Abstract
Internal energies and compressibility factors have been determined for neon, argon, krypton, and xenon. The calculations were performed using the reference-hypernetted chain approximation with minimized free energy. Realistic pair potentials (XC, HFD-C, etc.) were used, and corrections were made for non-additive interactions and the quantum behaviour. Excellent agreement with literature data for both the gas and liquid states was obtained up to 2·75 times the critical density. The liquid pressure is a very sensitive quantity. The three-body contributions to the pressure are sometimes greater than the pair contributions. For neon, the quantum corrections are also large. Small inaccuracies in the pair potentials result in noticeable deviations in the calculated values.