Test of three new corresponding states potentials for Ne, Ar, Kr, and Xe with application to thermal diffusion

The Barker-Pompe, Barker-Fisher-Watts, and Parson-Siska-Lee potentials for Ar have been studied as universal corresponding states models for Ne, Ar, Kr, and Xe. Optimum values of the scaling parameters ε and Rm have been found by fitting the potentials to second virial and viscosity data. The new models give a better fit to transport properties than the Lennard-Jones (12–6) for all the gases except Ne and are roughly comparable to the 11–6–8. The three new models, as well as the 11–6–8, predict a positive minimum for the thermal diffusion factor αT for all gas mixtures, suggesting that the recently reported positive minimum for Kr–Ar is theoretically reasonable. If this is so, then the negative minima reported for Ar–Ne and other systems contradict the law of corresponding states. Transport properties predicted by the Kr–Ar potential of Parson et al. were found to deviate badly from experiment.