The second-order Raman spectrum of crystalline germanium has been observed. Measurements were performed for several incident- and scattered-light polarizations so as to separate the three independent components of the Raman tensor. Interpreted in the light of recent neutron-scattering work by Nelin and Nilsson, the Γ₁ spectrum corresponds to overtone two-phonon processes. Overtone and combination processes are seen for the Γ₂₅, and Γ₁₂ components.
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Weinstein et al. (1973) studied this question.
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