Hyper‐Raman spectra of CsI, CsBr, RbI, and SrTiO 3 are measured at room temperature. All optical phonons at the I′‐point of the Brillouin zone can be detected including the longitudinal modes and one silent mode. The results obtained for SrTiO 3 are compared with data due to other experimental techniques. Superiority of hyper‐Raman speetroscopy in determining frequencies and linewidths is demonstrated.
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Vogt et al. (1979) studied this question.
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