Molecular motion in liquid-crystal phases of 4-octyl-4′-cyanobipheny (8CB) was studied with low-frequency Raman scattering and X-ray diffraction. A definite Raman band was found for the smectic phase with a peak at 9 cm-1. This band is assigned to the intermolecular vibration in the smectic layers with bimolecular structure, and is considered to indicate the existence of pseudo-lattice vibrations propagating along the direction perpendicular to the smectic layers.
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