Intermolecular potentials from crossed beam differential elastic scattering measurements VIII. He+Ne, He+Ar, He+Kr, and He+Xe

Abstract

Interatomic potentials for He‐rare gas pairs have been obtained by fitting a multiparameter potential to low energy differential cross sections and second virial coefficients. There appears to be no single reduced potential which is valid for all He‐rare gas systems; all asymmetric He‐rare gas potentials have wider attractive wells than that of He₂. r_m and ε for $\mathrm{He–Ne}\mathrm{,\hspace{0.17em}}\mathrm{He–Ar}\mathrm{,\hspace{0.17em}}\mathrm{He–Kr}$ , and $\mathrm{He–Xe}$ are 3.21 Å, 14.3°K; 3.54 Å, 24.2°K; 3.75 Å, 24.7°K; and 4.15 Å, 25.2°K, respectively. Commonly used combining rules do not provide good estimates for well depths of these systems.