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Experimental demonstration, using polarized Raman and infrared spectroscopy that both conventional and de Vries smectic A phase may exist in smectic liquid crystals with a first order A C* transition

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Figure

FIG. 2. ��1608 cmColor online� IR absorbance of phenyl stretching band−1� in the homeotropic and homogeneous alignment of theliquid crystalline compound C7.
FIG.3.4-methoxyltrisiloxyhexyloxy�3Chemicalstructureandphasesequenceof�-nitro-4�-�R�-1�methylhexyloxy�phenyl�phenyl4-�6-heptyl-�benzoate �TSiKN65�.
FIG. 7. �eter measurements of TSiKN65 for homogeneous and homeotropicColor online� Comparison of the apparent order param-configurations, obtained by IR absorbance.
FIG. 9. show the rubbing direction, layer normal, and opticalaxis, respectively. Vertical slanting dark thick bar is the spacer inbetween the two glass plates
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