Abstract
The theory of the absorption coefficient for a model of alkali-halide crystals in the multiphonon regime developed earlier by the authors is extended to incorporate the effects of a nonlinear dipole moment. The resulting expression for the absorption coefficient is evaluated for the Morse interatomic potential function and several choices for the nonlinear dipole moment. We suggest that the relative sign of the contributions to the absorption coefficient from crystalline anharmonicity and the nonlinear variation of the electric-dipole moment with interatomic separation is such that these contributions interfere constructively in the alkali halides.
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