Test of Combination Rules for Prediction of Interaction Second Virial Coefficients

The recently proposed argon pair potential of Dymond and Alder is shown to provide a satisfactory two‐parameter corresponding states description of the second virial coefficients of the rare gases. The potential is used as a basis for testing various combination rules for predicting interaction second virial coefficients for rare‐gas pairs. For helium binary systems, none of the rules tested produces uniformly acceptable results. Only the expression $${\epsilon }_{\mathrm{ij}}{\text{\hspace{0.17em}=\hspace{0.17em}2ε}}_{\mathrm{ii}}{\epsilon }_{\mathrm{jj}}{\mathrm{\hspace{0.17em}/\hspace{0.17em}(\epsilon }}_{\mathrm{ii}}{\mathrm{\hspace{0.17em}+\hspace{0.17em}\epsilon }}_{\mathrm{jj}})$$ appears satisfactory for all pairs not containing helium.