The low frequency polarized Raman spectra of monomer pTS crystals have been studied as a function of temperature. We observe two features associated with the incommensurate phase, which exists between Ti ~ 200 K and T1 ~ 155 K, and the related phase transitions. A soft mode (ampliton) is detected at all temperatures below Ti - 15 K and corresponds to a displacive behaviour in this temperature range. A line at 13 cm-1 is present only in the incommensurate phase. A possible mechanism for the detection of that line in this sole phase is discussed and shown to be in complete agreement with the neutron and I.R. data.
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Bertault et al. (1982) studied this question.
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