Low Frequency Raman Spectra in Ester Liquid Crystals Near Phase Transitions
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Abstract
Phase transitions of the ferroelectric liquid crystal were studied by recording low-frequency Raman spectra and three Raman lines at 15,49 and 93cm-1 were observed. The intensities of the 15 and 49 cm-1 modes reduce to zero at smectic C* transition temperature, and in the isotropic phase the 93cm-1 Raman line with partial frequency shift totally disappears. -