Infrared study of orientational order parameters of a ferroelectric liquid crystal.
Infrared study of orientational order parameters of a ferroelectric liquid crystal.
复制标题
铁电液晶取向有序参数的红外研究。
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
S. Zalewski
中科院分区：
文献类型：
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作者：
M. Ossowska;R. Korlacki;A. Kocot;R. Wrzalik;J. Chruściel;S. Zalewski
提出了一种确定铁电液晶四阶参数S、D、P和C的方法，利用不同样品几何形状的互补结果。红外测量进行了各向同性，平面非均质和平面均匀样品几何。在两个参照系中确定了取向序参数，以获得完整的分子排列信息。D、P和C参数的结果表明了内在和外在双轴性的重要性。分子绕长分子轴旋转不自由，羰基偶极子和中心苯基环的平面取向靠近倾斜面。发现跃迁偶极矩具有显著的相关性，纵向偶极矩为反平行，横向偶极矩为平行。
A method of determining the set of four order parameters S , D , P , and C for a ferroelectric liquid crystal, using complementary results for different sample geometries, is presented. IR measurements have been performed for homeotropic, planar heterogeneous and, planar homogenous sample geometries. Orientational order parameters were determined in two frames of reference to obtain complete information on molecular arrangement. Results for the D , P , and C parameters indicate the importance of both the intrinsic and extrinsic biaxialities. The molecular rotation around the long molecular axis is not free, and the carbonyl dipole and plane of the central phenyl ring are oriented close to the tilt plane. It has been found that transition dipole moments show significant correlations, antiparallel for longitudinal dipoles and parallel for transversal ones.