Modified statistical method for intermolecular potentials. Combining rules for higher van der Waals coefficients

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Abstract
A modification of the Gordon‐Kim statistical method for calculating intermolecular potentials is presented, discussed, and shown to give a reasonable estimate of the whole potential curve for both like and unlike pairs of noble gas atoms. Rae's correction to the exchange energy is used, but double counting of the correlation energy is avoided by using the van der Waals energy in lieu of the statistical correlation energy at large internuclear separations. Simple but apparently reliable combining rules for the van der Waals C8 and C10 coefficients are derived and tested. Calculated interatomic potentials are given for all pairs of noble gas atoms.