Time-Resolved Fourier-Transform Infrared Spectroscopy on the Inter- and Intramolecular Orientational Dynamics in Ferroelectric Liquid Crystalline Dimers
Time-Resolved Fourier-Transform Infrared Spectroscopy on the Inter- and Intramolecular Orientational Dynamics in Ferroelectric Liquid Crystalline Dimers
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时间分辨傅里叶变换红外光谱研究铁电液晶二聚体分子间和分子内取向动力学
DOI：
10.1103/physrevlett.79.1686
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发表时间：
1997
影响因子：
8.6
通讯作者：
R. Zentel
中科院分区：
文献类型：
--
作者：
S. Shilov;H. Skupin;F. Kremer;T. Wittig;R. Zentel
基于时间分辨步进扫描红外光谱数据，我们提出了手性液晶二聚体铁电和电斜转换过程中片段重新取向的详细模型。我们发现分子片段的运动幅度彼此不同：液晶原的倾斜角度最大，而“虚拟聚硅氧烷主链”的倾斜角度最小。与最近发表的猜想相反，我们证明在\ensuremath{\mu}s尺度上，不同分子片段的响应彼此明确同步。
On a base of time-resolved step-scan IR-spectroscopy data, we present a detailed model of the segmental reorientation during the ferroelectric and electroclinic switching of a chiral liquid crystalline dimer. We detected that the magnitude of the motion of the molecular segments differ from each other: The tilt angle is maximal for the mesogens and minimal for the ``virtual polysiloxane backbone.'' In contrast to a recently published conjecture, we prove that in the \ensuremath{\mu}s scale the responses of different molecular segments are unambiguously synchronous with each other.