Testing intermolecular potential functions using transport property data. Part 3.—Binary diffusion coefficient of methane + perfluoromethane

Abstract

The binary diffusion coefficient D₁₂ for methane + perfluoromethane has been measured by a two-bulb method at 302.8, 323.2 and 342.9 K, and the application of a simple “inversion” technique gives three points on an effective spherically averaged intermolecular pair potential. Comparison with the spherical CH₄-CF₄ potential obtained from a full inversion of interaction viscosities indicates differences in the separation at a given energy of the order of 2 %.