Multiphonon Infrared Absorption in the Highly Transparent Frequency Regime of Solids

Publisher Summary The chapter presents a review on the considerable activity directed toward the multiphonon infrared absorption (MIRA) problem and discusses the progress in the field. The chapter presents a brief discussion on some of the physics surrounding MIRA, as well as some of the general theoretical considerations. The chapter presents a detailed description of various approaches and the models employed by various investigators, an overview of the results which have been obtained. The application of sum rules to MIRA is described. The experimental picture, regarding both methods and results are addressed. Comparisons of experimental results with theoretical predictions are indicated. The principal conclusions emerging from investigations of MIRA are summarized, and a discussion of the status of the field is presented. Multiphonon absorption of light in solids results both directly from nonlinearities in the electric moment, as well as indirectly from anharmonic interaction of the phonons excited by the light. Conventionally, the term "anharmonicity absorption" (AA) refers to the MIRA in IR-active solids resulting from the excitation and subsequent decay of the IR-active phonon(s). This interaction is mediated by the electric dipole moment, that is, terms in the moment that are linear in lattice displacements.

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