Attractive forces prove to be dominant at long range. Here, the meaning of long range is such that the overlap of electronic distributions in the molecules that are interacting can be neglected.
Repulsive contributions to the intermolecular forces are dominant when molecules are forced to within small separations of each other, i.e., into regions where there is significant overlap of the respective electron charge clouds in the molecules.
KeywordsHard Sphere Pair Potential Intermolecular Force Virial Coefficient Potential Energy Curve
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