和频产生振动光谱：实验几何结构对一种或多种吸收介质的影响。

Sum frequency generation vibrational spectra: the influence of experimental geometry for an absorptive medium or media.

作者信息

York Roger L, Li Yimin, Holinga George J, Somorjai Gabor A

机构信息

Department of Chemistry, University of California, Berkeley, California 94720, USA.

出版信息

J Phys Chem A. 2009 Mar 26;113(12):2768-74. doi: 10.1021/jp808629r.

DOI:10.1021/jp808629r

PMID:19239214

Abstract

The influence of experimental geometry on infrared total internal reflection surface sum frequency generation (SFG) vibrational spectra at the water/solid interface has been examined. A detailed analysis of the experimental geometry revealed that the enhancement of SFG signal for the "critical angle" can be much weaker than previously thought if the index of refraction of the transmitted or reflected medium is treated as a complex value (i.e., the imaginary part of the index of refraction is not zero and not neglected). The theoretical analysis outlined here agreed well with the experimental results of the SFG spectra of the silica/water interface in two different geometries. This paper deals with the SSP polarization combination.

摘要

研究了实验几何结构对水/固界面红外全内反射表面和频产生（SFG）振动光谱的影响。对实验几何结构的详细分析表明，如果将透射或反射介质的折射率视为复数值（即折射率的虚部不为零且不可忽略），那么“临界角”处SFG信号的增强可能比之前认为的要弱得多。此处概述的理论分析与两种不同几何结构下二氧化硅/水界面SFG光谱的实验结果吻合良好。本文探讨的是SSP偏振组合。