Raman Scattering Study of SFrfaces

本研究的目的是发展表面科学的拉曼光谱，并扩大其应用范围。本研究得到的主要结果可以总结如下：1。建立了一种高效的表面拉曼光谱仪系统，该系统可以检测单层到多层表面吸附物，同时对其绝对效率进行了严格的校准。精确地定义了拉曼散射的绝对截面。得到了cu -酞菁在银膜上和硝基苯在Ni（111）上的横截面。根据散射光的能谱和偏振特性确定了这些吸附物的聚集态。本文测量了在非常粗糙的银表面上吸附物的拉曼强度与散射角的关系，并提出了一个与实验结果相吻合的模型。对吡啶在银上的分子振动进行了正态分析，并与实验数据进行了比较。研究发现，电子从底物回给吡啶分子的元C-C键导致该键的弹性常数增加。电场诱导拉曼光谱发现，2单层厚度的Cs分子吸附在p型GaAs上产生1.5eV的能带弯曲。

The purpose of this study is to develop Raman spectroscopy for surface science and to extend the range of its applications. The main results obtained by this study can be summarized as follows :1. A high efficiency surface Raman spectrometer system has been constructed, by which a monolayer to several layers of surface adsorbates can be detected, and at the same time, whose absolute efficiency is rigorously calibrated.2. The absolute Raman scattering cross-section has been precisely defined. The cross-sections for Cu-phthalocyanine on silver film and nitrobenzene on Ni (111) have been obtained. The aggregation states of these adsorbates have been determined from the energy spectra and the polarization of the scattered light.3. The scattered angle dependence of the Raman intensity from adsorbates on a very rough Ag surface has been measured and a model which reproduces the experimental results has been proposed.4. A normal mode analysis has been carried out for molecular vibrations of pyridine on silver and the result has been compared with experimental data. It has been found that back donation of electrons from the substrate to the meta C-C bond of the pyridine molecule results in the increase of the spring constant of that bond.5. It has been found by the electric field induced Raman spectroscopy that the band bending of 1.5eV is produced by the adsorption of Cs molecules of 2 monolayear thickness on p-type GaAs.