Second Virial Coefficient between Unlike Molecules

抄録

By means of the core model of molecules introduced by Kihara in Revs. Modern Phys. 25 (1953) potentials between unlike molecules in nonpolar gases have been determined from the second virial coefficients. The intermolecular potential U_AB for the pair of molecules (A, B) is assumed to be a function of the shortest distance ρ between the cores of the molecules, and furthermore
U_AB(ρ)=U_0AB\left[\left(\fracρ_0ABρ\ ight)\ ight]¹²−2\left(\fracρ_0ABρ\ ight)⁶\biggr].
Here U_0AB and ρ_0AB are constants which have been determined. Regarding these model constants the following relations have been verified:
ρ_0AB=\frac12(ρ_0AA+ρ_0BB),
U_0AB=(U_0AAU_0BB)^1⁄2.