Second Virial Coefficients of Helium from the Exp-Six Potential

Abstract

A set of potential constants for the He-He exp-six intermolecular potential has been found which leads to calculated results in good agreement with the experimental second virial coefficients of ${\mathrm{He}}^4$ both at high and at low temperatures and with the high-temperature viscosity and thermal conductivity data. A table of the second virial coefficients of ${\mathrm{He}}^3$ and ${\mathrm{He}}^4$ over the temperature range 0.3°K to 60°K is given. The position of a negative discrete energy as a function of some of the parameters of the exp-six potential has been investigated.