Dipolar Coupling and Molecular Vibrations in Crystals. III. Polarizabilities of Molecular Anions and the Internal Field in Some Rhombohedral Crystals

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Abstract
Using the formalism and the dipole coupling sums developed in an earlier paper the equations relating the optical refractive indices to ionic polarizabilities are given for certain classes of rhombohedral crystals. Anion polarizabilities are calculated from measured refractive indices and previously calculated cation polarizabilities for several series of crystals. Finally the validity of the widely used Lorentz–Lorenz internal field in these systems is examined.

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