Probing field-induced submolecular motions in a ferroelectric liquid crystal mixture with time-resolved two-dimensional infrared spectroscopy
Probing field-induced submolecular motions in a ferroelectric liquid crystal mixture with time-resolved two-dimensional infrared spectroscopy
复制标题
用时间分辨二维红外光谱探测铁电液晶混合物中场引起的亚分子运动
DOI：
10.1088/0953-8984/18/32/008
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
W. Shih
中科院分区：
文献类型：
--
作者：
Jung Y. Huang;W. Shih
时间分辨二维红外 (2D IR) 光谱已用于分析电光开关铁电液晶 (FLC) 混合物。 2D IR 相关技术清楚地表明，SmC* 相中的 Goldstone 模式受到外加电场的抑制。场诱导的重新定向过程从大约 10 µs 内的分子内运动开始。然后，分子内运动从附着在同一分子上的分子片段传播到其他周围分子上的片段。在场引起的切换过程中，红外偶极子经历集体重新定向，但绕分子长轴的旋转受到阻碍。
Time-resolved two-dimensional infrared (2D IR) spectroscopy has been applied to analyse an electro-optic switching ferroelectric liquid crystal (FLC) mixture. The 2D IR correlation technique clearly shows that the Goldstone mode in the SmC* phase is suppressed by an applied electric field. The field-induced reorientation process initiates from intramolecular motions in about 10 µs. The intramolecular motions then propagate from the molecular segments attached to the same molecule to those fragments on other surrounding molecules. During the field-induced switching, the IR dipoles undergo a collective reorientation but with hindered rotation about the molecular long axis.