Prediction of the Attractive Branch of the Effective Pair Potential Using the Joule–Thomson Inversion Curve

In the present work, the attractive branch of the effective pair potential is predicted by using p-v-T data of the Joule-Thomson inversion curve. It is concluded that all loci of the thermodynamic states of the inversion curve correspond to the attractive branch of the effective pair potential. It is also predicted that the minimum of the effective pair potential well, rm, is less than that of the isolated pair potential, because the attraction term has a longer range than the repulsion term.