Abstract
Present knowledge concerning the dipole which forms between a pair of molecules due to electron cloud overlap and electron correlation is reviewed. The experimental information, derived from collision-induced spectra in the infrared, is analyzed. Theoretical calculations of the dipoles are described. Increasing sophistication in both approaches is shown to lead eventually to agreement between them. The case of the rare gases—the most researched by far—is taken up in detail, and the dipoles there are shown to have a common reduced form. They are also shown to correlate with other properties, in particular the intermolecular potential. Ternary interaction dipoles are touched upon.

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