●a Chapter VI Interaction between Molecules,2 (4)Total Energy of intermolecular interactions up 30,al e=E+e+e p (4)2R‖3k7 +a1h2+h+2(1+I2 2021821 Chemistry Departme nt of Fudan UniversityPhysical ChemistryI Chapter VI Interaction between Molecules 2021/8/21 Chemistry Department of Fudan University 7 (4) Total Energy of intermolecular interactions 2 2 1 2 1 2 1 2 2 2 e p d 1 2 1 2 6 0 1 2 1 2 3 (4 ) 3 2 I I E E E E R kT I I   a a a  a     = + + = − + + +       （ + ）