Raman and infrared spectra of linear-chain models of mixed crystals are investigated. Motion along more than one direction is allowed. Much of the phenomenology of real linear-chain compounds such as ZrS_3-x{Se}ₓ$ can be qualitatively accounted for: preservation of the Raman and infrared symmetries present in the parent pure compounds, one-, two-, and three-mode behavior, disorder-induced linewidths, and line-shape asymmetries. The physical nature and significance of many of these observed phenomena is clarified.
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Castillo et al. (1986) studied this question.
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