A new formula is derived for the dipole-dipole term in the van der Waals interaction between two spherically symmetrical atoms. The approximation consists in taking the distortion of each atom in the instantaneous dipole field of the other atom to be proportional to the corresponding adiabatic distortion, and the co-efficients of proportionality are variationally determined. Good agreement with the results of other calculations is obtained in a number of cases involving atomic hydrogen and the inert gases.
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U. Öpik (1967) studied this question.
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