Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
J Phys Chem A. 2012 Jun 14;116(23):5560-70. doi: 10.1021/jp301070a. Epub 2012 May 31.
Polarized Raman scattering from a thin film involving uniaxial optical anisotropy deposited on a dielectric substrate has analytically been theorized. The analyte film is modeled as a three-phase system (air/film/substrate) to calculate the electromagnetic fields of the incident and scattered light propagating across the system with an aid of the transfer matrix method to exactly take the optical anisotropy of the film into account. On the new theory, a methodology for molecular orientation analysis of an extended polymethylene chain in the film is proposed, which is employed for determination of the tilt angles of the chains in single- and five-monolayer Langmuir-Blodgett (LB) films of cadmium stearate deposited on a glass plate. The results agree well with those obtained by infrared spectroscopy, which confirms reliability of the present method.
已对沉积在介电基底上的单轴各向异性薄膜的偏振喇曼散射进行了理论分析。分析物薄膜被建模为三相系统（空气/薄膜/基底），以通过转移矩阵方法计算穿过系统传播的入射光和散射光的电磁场，从而准确考虑薄膜的各向异性。在新理论的基础上，提出了一种分析薄膜中扩展聚亚甲基链分子取向的方法，该方法用于确定在玻璃基板上沉积的硬脂酸镉单分子层和五层 Langmuir-Blodgett (LB) 薄膜中链的倾斜角。结果与红外光谱法的结果吻合较好，这证实了本方法的可靠性。
