Abstract

A previous theory of the first-order Raman scattering induced by color centers in alkali halides has been extended to include second-order contributions. We discuss under what conditions the second (or higher) order spectra of the imperfect lattice display the peculiarities of the projected densities for the perturbed two (or many) phonon states. The coupling coefficients weighting the above densities, namely the second-order strain derivatives of the electronic polarizability tensor, are qualitatively related to some macroscopic observable quantities.

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