| Abstract: | Second‐ and third‐order time‐dependent perturbation theory within the multipolar framework of nonrelativistic quantum electrodynamics is used to calculate the retarded dispersion interaction between two diamagnetic molecules, a diamagnetic molecule and a magnetic‐dipole susceptible molecule, and a diamagnetic molecule and an electric‐quadrupole polarizable molecule. New expressions for the energy shift valid for all intermolecular separation distances, R, beyond the region of overlap of molecular electronic wave functions and applicable to a pair of randomly oriented molecules in the ground electronic state are given. The R‐dependent behavior of the far‐zone limit of the interaction energies is also examined. © 2000 John Wiley & Sons, Inc. Int J Quant Chem 78: 437–442, 2000 |
