Abstract
Davydov's theory of factor group splitting in molecular crystals has been revisited. It is observed that the dipole-dipole interaction alone is not sufficient to account for the splitting in some simple crystals. The effect of multipole interactions in the electrostatic energy including those which may be present even before the vibrational excitation must be investigated. It is shown that in case of calcium hydroxide and magnesium hydroxide crystals the quadrupolar interactions have a preponderant role in the Davydov splitting.
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