Atomic interactions in the heavy Noble gases

Argon viscosity coefficients and spectroscopic constants are calculated for the three-parameter potential of Smith and Thakkar. Good agreement with experiment is found. Parameters for krypton and xenon are determined by fitting to semi-empirical dispersion coefficients and experimental second virial coefficients. Viscosity coefficients for krypton and xenon are calculated as an independent test of the potentials so determined. Agreement with experiment is found to be good. The vibrational structure of the ground state of the krypton and xenon dimers is predicted from these potentials. It is concluded that this potential function is adequate for simultaneous correlation of dispersion, viscosity and second virial coefficients of the Noble gases and the vibrational energy levels of their dimers.