Direct determination of pair potential energy function from extended law of corresponding states and calculation of thermophysical properties for H2-He

A new correlation equation for the low-density binary diffusion and viscosity collision integrals of hydrogen-helium over a very large reduced temperature range from 1 to the onset of ionization is obtained. These equations has been inverted directly to give the isotropic reduced intermolecular potential energy curve for H2-He, corresponding to the viscosity collision integrals and we used these data in conjunction with the second virial coefficient to calculate outer branch of the potential well. Comparison is made between the present MSV interaction potential energy function and the independently known H2-He potential energy function. The present potential function provides the best overall agreement for the available low-density gas phase thermophysical data, i.e., transport properties in a wide composition and temperature range.