The calculation of some properties of hydrogen gas at low temperatures

Abstract

Some further study of molecular collisions using a non-spherical intermolecular potential in hydrogen gas at low temperatures is presented in this paper. Pairs of coupled equations for radial wave functions for the para-ortho collision problem are solved numerically using the U. C. L. electronic computer. The para-para collisions are also studied. The results make it likely that the difference between the viscosity cross-sections for para-para and para-ortho collisions can be explained mainly by the non-spherical nature of the potential, together with the effect of the statistics applicable in the various cases. The second virial coefficient is also calculated.