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.
Our theoretical results are then used in the interpretation of the F-center induced Raman spectra of NaBr, which have been measured recently by Buchenauer and Fitchen. A defect model whose perturbation extends as far as fourth neighbors, including the change in nearest neighbor (nn) force constant and the elastic relaxation effects, is used.
Excellent agreement is found between theoretical and experimental data. From the analysis of the experimental F-center Raman spectra, information on the coupling constants for the phonon hole-electron pair interaction and on the separation between 2p and 2s states is also obtained.
This work is sponsored in part by Consiglio Nazionale delle Richerche and in part by E.O.A.R. under Grant AF-EOAR 67-8.
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Benedek, G., Mulazzi, E. (1969). Theoretical Investigation of the F- Center Raman Spectra in Na Br: First and Second Order Processes. In: Wright, G.B. (eds) Light Scattering Spectra of Solids. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-87357-7_56
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DOI: https://doi.org/10.1007/978-3-642-87357-7_56
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