Molecular simulation of the phase behavior of noble gases using accurate two-body and three-body intermolecular potentials

Gibbs ensemble Monte Carlo simulations are reported for the vapor-liquid ph ase coexistence of argon, krypton, and xenon. The calculations employ accur ate two-body potentials in addition to contributions from three-body disper sion interactions resulting from third-order triple-dipole, dipole-dipole-q uadrupole, dipole-quadrupole-quadrupole, quadrupole-quadrupole-quadrupole, and fourth-order triple-dipole terms. It is shown that vapor-liquid equilib ria are affected substantially by three-body interactions. The addition of three-body interactions results in good overall agreement of theory with ex perimental data. In particular, the subcritical liquid-phase densities are predicted accurately. (C) 1999 American Institute of Physics. [S0021-9606(9 9)50728-9].