Low Frequency Raman Spectra in Ester Liquid Crystals Near Phase Transitions

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.