Role of refractive index in sum frequency generation intensity of salt solution interfaces
Role of refractive index in sum frequency generation intensity of salt solution interfaces
复制标题
折射率对盐溶液界面和频产生强度的作用
DOI：
10.1016/j.cclet.2015.10.020
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发表时间：
2015-12-01
影响因子：
9.1
通讯作者：
Guo, Yuan
中科院分区：
文献类型：
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作者：
Li, Xia;Feng, Rong-Juan;Guo, Yuan
和频发生光谱(SFG)已被广泛用于研究具有生物或环境意义的水盐溶液的界面化学。大多数SFG数据分析使用相同的体积折射率来处理不同的盐浓度，尽管折射率不同。在这里，我们系统地研究了在不同的实验条件下，折射率对SFG强度的影响。研究发现，在全内反射几何形状附近的固/液界面，SFG强度对折射率的影响最为敏感。在气/液界面，折射率的影响也是不可忽略的。因此，一些重要的SFG结果，如水结构对SiO_2/水界面离子强度的响应，需要重新评估。这些关于折射率微小变化影响的结论对SFG数据分析的一般实践是有用的。(三)中国医学科学院中国化学会、药物所2015年。爱思唯尔出版，版权所有。
Sum frequency generation spectroscopy (SFG) has been widely used to study the interfacial chemistry of aqueous salt solutions of biological or environmental importance. Most of the SFG data analysis used the same bulk refractive index for different salt concentrations despite of the variations of the refractive indices. Here we systematically investigate the influence of the refractive index on the SFG intensities at various experimental conditions. It is discovered that the SFG intensities are the most sensitive to the refractive index at solid/liquid interfaces nearby the total internal reflection geometries. At air/liquid interfaces, the effect of the refractive indices is also nonegligible. Consequently some important SFG results, such as the response of water structures to the ionic strength at the SiO2/aqueous interfaces,are necessary to be reevaluated. These conclusions on the effect of the small variations of the refractive index are generally useful for the common practice of SFG data analysis. (C) 2015 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.