Orientation Angle of Molecules at Hexadecane-Water Interface Studied with Total Internal Reflection Second Harmonic Generation  

作　　者：Li-bo Zhang Hui Fang Shun-li Chen Xue-feng Zhu Wei Gan 

机构地区：[1]LaboratoryofEnvironmentalScienceandTechnology,TheXinjiangTechnicalInstituteofPhysicsChemistry,KeyLaboratoryofFunctionalMaterialsandDevicesforSpecialEnvironments,ChineseAcademyofSciences,Urumqi830011,China [2]UniversityofChineseAcademyofSciences,Beijing100049,China

出　　处：《Chinese Journal of Chemical Physics》2016年第6期650-656,I0001,共8页化学物理学报（英文）

摘　　要：The orientation angle is an important parameter that reflects the structure of molecules at interfaces. In order to obtain this parameter, second order nonlinear spectroscopic techniques including second harmonic generation （SHG） and sum frequency generation-vibrational spec- troscopy （SFG-VS） have been successfully applied through analysis of the nonlinear signal from various polarizations. In some SHG and SFG-VS experiments, total internal reflection （TIR） configuration has been adopted to get enhanced signals. However, the reports on the detailed procedure of the polarization analysis and the calculation of the orientation angle of interracial molecules under TIR configuration are still very few. In this paper, we mea- sured the orientation angles of two molecules at the hexadecane-water interface under TIR and Non-TIR experimental configurations. The results measured from polarization analysis in TIR configuration consist with those obtained from Non-TIR configuration. This work demonstrates the feasibility and accuracy of polarization analysis in the determination of the orientation angle of molecules at the interfaces under TIR-SHG configuration.

关 键 词：Second harmonic generation Total internal reflection HYPERPOLARIZABILITY Polarization Orientation angle 

分 类 号：TN256[电子电信—物理电子学] O484.41[理学—固体物理]