Dipole-dipole interaction and internal vibrations in molecular crystals

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Abstract
The contribution of long-range dipole-dipole forces to the energy of the internal modes in a series of molecular crystals has been evaluated using the Weald-Kornfeld summation method. Comparison with experimental infrared observations such as LO-TO and Davydov splittings, gas to crystal frequency shifts, band shapes, transition dipole moments, phonon bandwidths, is discussed.