
TY  - JOUR
A1  - Johnson, CHJ 
A1  - Spurling, TH 
T1  - Non-additivity of intermolecular forces: effects on the fourth virial coefficient
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1974
VL  - 27
IS  - 2
SP  - 241
EP  - 247
KW  - 
UR  - https://doi.org/10.1071/CH9740241 
N2  - In this paper we give the results of computing the effect of non-additivity of long range forces on the fourth virial coefficient of a Lennard-Jones 12-6 gas. We have considered only dipolar effects but have included all terms up to the fourth order of perturbation theory. We have also calculated the effect of the fourth-order triple-dipole term on the third virial coefficient. For the fourth virial coefficient we find that the dispersion non-additivity, while being positive at low reduced temperatures, goes through a negative minimum at a reduced temperature of about 1.25 before becoming small and positive at high temperatures. This is in contradistinction to the behaviour of the third virial co-efficient where the dispersion non-additivity is always positive. 
ER  -

