Perturbation Theory Approach to Intermolecular Potential Energy Surfaces of van der Waals Complexes

1. First-Order (Heitler-London) Exchange 2. Exchange-Induction Interaction 3. Exchange-Dispersion Interaction D. Convergence Properties of Symmetry-Adapted Theories IV. Multipole Expansion of Interaction Energy A. General Asymptotic Expansion of Interaction Energy B. Multipole Expansion of Intermolecular Interaction Operator C. van der Waals Constants D. Convergence Properties of Multipole Expansion of Interaction Energy E. Angular Dependence of Interaction Energy F. Computations of van der Waals Constants Ill. Exchange Effects