The Spatial Dimension of Adsorption and Reaction of Metal Surfaces

该研究项目由分析和表面化学项目支持，研究表面反应的空间维度。利用扫描隧道显微镜和特高压光谱技术，罗伊特-罗比教授和她在马里兰大学帕克分校的同事们正在探索金属表面上的自扩散事件，以及这些事件与这些表面上的吸附和反应过程的相互作用。氢在邻近Al（111）表面的吸附用于探测台阶表面的位置分布和吸附驱动的台阶运动和切面。在Ag（001）表面上对吸附的碘苯和丙基化物的碳-碳偶联反应进行了监测，以解决反应概率的有序性和空间依赖性问题。在表面反应的空间依赖性研究中，罗伊特-罗比教授正在研究多相催化的分子机制。利用微观和光谱方法来解决这些问题，她能够阐明由反应物吸附引起的催化剂步进运动的详细机制，以及反应物取向对特定反应发生可能性的影响。从这些研究中获得的信息有助于深入了解多相催化这一重要技术领域。

This research project, supported by the Analytical and Surface Chemistry Program, investigates the spatial dimension of surface reactions. Using scanning tunneling microscopy and UHV spectroscopic techniques, Professor Reutt-Robey and her coworkers at the University of Maryland-College Park are exploring self-diffusion events on metallic surfaces and the interaction of these events with adsorption and reaction processes on these surfaces. Hydrogen adsorption on vicinal Al(111) surfaces is used to probe stepped surface site distributions and adsorption driven step motion and facetting. Carbon-carbon coupling reactions of adsorbed iodobenzene and propyliodide are monitored on the Ag(001) surface in order to address the questions of reactant ordering and spatial dependences of reaction probabilities. In studies of the spatial dependence of surface reactions, Professor Reutt-Robey is addressing the molecular mechanisms of heterogeneous catalysis. Using microscopic and spectroscopic approaches to these questions, she is able to elucidate the detailed mechanisms of catalyst step motion induced by reactant adsorption, and the effect of reactant orientation on the likelihood of a particular reaction occurring. The information gained from these studies is useful in developing a detailed understanding of the technologically important field of heterogeneous catalysis.