2A05 MHPOBCの偏光ラマン散乱測定

概要

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Polarized Raman scattering was measured on the successive smectic phase, SmA, SmC_α^*, SmC^*, SmC_γ^ * and SmC_A^* of MHPOBC. 2nd and 4th order parameters of the Raman tensor, <P_2> and <P_4>, were evaluated. The C-C stretching mode of phenyl rings and C=O stretching modes of carbonyl groups in core and chiral parts of each smectic phase were investigated in this report. The tilt angle for spiral axis was taken into consideration for the analysis of the order parameters. <P_2> and <P_4> obtained were plotted with respect to the temperature. It was noticed that the values of the order parameters, especially of <P_4>, exhibited considerable dip at the temperature range of the SmC^* phase. Moreover <P_4> obtained for the C=O stretching mode of chiral CO group showed a prominent decrease comparing with the others, while <P_2> showed a similar change. This fact suggested the specific dynamics for the chiral CO group in the process of the transition around SmC^* phase.
日本液晶学会の論文
1998-10-12