Abstract
A theory of dielectric polarization is described in which each ion in an alkali-halide crystal is considered as a separate entity capable of being distorted internally by an electric field. Three stiffness coefficients suffice to describe the interaction between the local electric field and the polarizable ion. The Lorentz internal field is shown to be valid for this calculation. Optical and dielectric polarizabilities per molecule and infra-red absorption frequencies in alkali-halide crystals calculated by this method are shown to be in substantial agreement with experiment. Electronic polarizabilities of free (gaseous) ions are also calculated, and a novel "pseudo-piezoelectric" effect is predicted.
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