By use of an yttrium aluminum garnet laser operating at 2.1 {μ}m, polarized transmission Raman spectra of Ge(As) have been measured for impurity concentrations spanning the Mott transition. The valley-orbit Raman line broadens markedly at the transition; its line shape has been fitted using the London-Heitler method. The spectrum in the metallic regime constitutes the first observation of single-particle scattering from intervalley fluctuations.
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Doehler et al. (1975) studied this question.
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