Infrared Spectroscopy of Molecules on Metal Surfaces

该研究项目由分析和表面化学项目支持，继续研究吸附在金属表面的分子的红外光谱。详细的反射-吸收红外光谱研究甲基硫酸盐，甲氧基，乙炔部分吸附在银，铜和铑表面将进行。所有这些体系都表现出费米共振效应，将对称的C-H拉伸基与甲基弯曲泛音耦合在一起，并作为吸附质分子之间以及吸附质与表面之间重要物理相互作用的优秀模型。这项工作所建立的定量认识将在红外光谱研究表面化学方面具有广泛的适用性。广泛使用红外光谱来研究表面化学过程的机理是一种方法的发展，它增加了对许多重要的非均相系统的理解。本研究项目的目标是发展分子在表面吸附的红外光谱的详细知识，这将使红外继续用于监测表面反应。高分辨率红外方法提供了丰富的信息，本研究项目的结果将对这些方法的发展和实施至关重要。

This research project, supported in the Analytical and Surface Chemistry Program, continues studies of the infrared spectroscopy of molecules adsorbed on metal surfaces. Detailed reflection-absorption infrared spectroscopic studies of methyl thiolate, methoxy, and ethylidyne moieties adsorbed on silver,copper, and rhodium surfaces will be carried out. All of these systems exhibit Fermi resonance effects which couple the symmetric C-H stretch fundamental with methyl bending overtones, and serve as excellent models of the important physical interactions between adsorbate molecules and between the adsorbate and the surface. The quantitative understanding developed in this work will have wide applicablility in the use of infrared spectroscopy to study surface chemistry. %%% The widespread use of infrared spectroscopy to study the mechanisms of surface chemical processes is a method development which has provided an increased understanding of a number of important heterogeneous systems. The goal of this research project is to develop the detailed knowledge of the infrared spectroscopy of molecules adsorbed at surfaces which will enable the continued use of infrared to monitor surface reactions. High resolution IR methods provide a wealth of information, and the results of this research project will be essential to the development and implementation of these methods.