Evaluation of Surface vs Bulk Contributions in Sum-Frequency Vibrational Spectroscopy Using Reflection and Transmission Geometries†
Evaluation of Surface vs Bulk Contributions in Sum-Frequency Vibrational Spectroscopy Using Reflection and Transmission Geometries†
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DOI：
10.1021/jp9933929
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发表时间：
2000-03
影响因子：
3.3
通讯作者：
X. Wei;S. Hong;A. Lvovsky;H. Held;Y. Shen
中科院分区：
文献类型：
--
作者：
X. Wei;S. Hong;A. Lvovsky;H. Held;Y. Shen
设计了一个测量反射和透射两种情况下和频产生（SFG）光谱的实验。从十八烷基三氯硅烷单层基板上的结果表明，虽然在两种几何形状的共振光谱都起源于表面单层，散装基板有一个显着的贡献，在透射光谱的非共振背景。聚乙烯薄膜的研究还表明，大部分贡献的SFG光谱是唯一的传输几何形状，表现出的共振模式中不可观察到的反射光谱显着。
An experiment was designed to measure sum-frequency generation (SFG) spectra in both reflection and transmission. The result from an octadecyltrichlorosilane monolayer on a substrate reveals that while the resonant spectra in the two geometries both originate from the surface monolayer, the bulk substrate has a significant contribution to the nonresonant background in the transmitted spectra. Study of a polyethylene film also shows that the bulk contribution to the SFG spectra is only significant for the transmission geometry, exhibiting a resonant mode not observable in the reflected spectra.