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Quantitative Surface Chirality Detection with Sum Frequency Generation Vibrational Spectroscopy: Twin Polarization Angle Approach
Feng Wei1, Yan-yan Xu2, Yuan Guo2, Shi-lin Liu2, Hong-fei Wang2
1.Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;2.Beijing National Laboratory for Molecular Sciences, Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Abstract:
Here we report a novel twin polarization angle (TPA) approach in the quantitative chirality detection with the surface sum-frequency generation vibrational spectroscopy (SFG-VS). Generally, the achiral contribution dominates the surface SFG-VS signal, and the pure chiral signal is usually two or three orders of magnitude smaller. Therefore, it has been difficult to make quantitative detection and analysis of the chiral contributions to the surface SFG-VS signal. In the TPA method, by varying together the polarization angles of the incoming visible light and the sum frequency signal at fixed s or p polarization of the incoming infrared beam, the polarization dependent SFG signal can give not only direct signature of the chiral contribution in the total SFG-VS signal, but also the accurate measurement of the chiral and achiral components in the surface SFG signal. The general description of the TPA method is presented and the experiment test of the TPA approach is also presented for the SFG-VS from the S- and R-limonene chiral liquid surfaces. The most accurate degree of chiral excess values thus obtained for the 2878 cm-1 spectral peak of the S- and R-limonene liquid surfaces are (23.7±0.4)% and (-25.4±1.3)%, respectively.
Key words:  Sum-frequency generation vibrational spectroscopy, Twin polarization angle approach, Surface, Chirality, Limonene
FundProject:
Quantitative Surface Chirality Detection with Sum Frequency Generation Vibrational Spectroscopy: Twin Polarization Angle Approach
魏锋1, 徐妍妍2, 郭源2, 刘世林2, 王鸿飞*2
1.中国科学技术大学合肥微尺度物质科学国家实验室,化学物理系,合肥230026;2.北京分子科学国家实验室,分子动态与稳态结构国家重点实验室中国科学院化学研究所,北京100190
摘要:
介绍了一种新的表面和频振动光谱方法: 定量手性检测中的双偏振角方法. 一般来讲表面光谱信号中非手性项贡献最强,而纯界面手性信号要比非手性信号弱两到三个数量级. 因此在和频振动光定量测量和分析界面手性的贡献问题上存在困难. 在和频振动光谱的双偏振角方法中,通过固定入射红外光偏振方向,并同时改变入射可见光和初涉和频信号光的偏振角进行测量. 这样所得到的偏振依赖的和频振动光谱信号能够直接给出界面手性贡献的特征,并 且能够用于准确测量界面的手性和非手性贡献. 对双偏振角方法进行了描述,并且通过S和R手性的柠檬烯空
关键词:  和频振动光谱,双偏振角,表面,手性,柠檬烯
DOI:10.1088/1674-0068/22/06/592-600
分类号: