On the Coupling between Electronic and Nuclear Motion and Van der Waals' Interaction between Helium Atoms

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Abstract
The analytical expression for the potential due to the coupling between the electronic and the nuclear motion for two normal helium atoms has been obtained for a wave function of the form of that of P. Rosen. This coupling interaction is a repulsive potential and is to be added to the usual ``valence'' and Van der Waals' potential obtained in the static-nuclei approximation. This coupling interaction, being inversely proportional to the reduced mass of the two interacting atoms, contributes to a weaker binding between two He3 atoms than between two He4 atoms.

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