The Role of Substrate Band Structure in Photochemistry on Metal Surfaces

这个研究项目，与分析和表面化学计划的支持下，解决了吸附和反应的光子和电子激发驱动的表面上的动力学的根本重要性的问题。 匹兹堡大学的Petek和Yates教授将联合收割机飞秒时间分辨双光子光电子发射与电子受激解吸离子角分布研究相结合，以探测基底电子结构对表征良好的金属表面上简单吸附物的详细光化学的影响。 吸附在银和铂表面上的二氧化硫和一氧化碳是感兴趣的模型系统。 时间分辨光电子显微镜提供了关于特定缺陷位点对表面光化学过程的影响的信息。 从这些研究中获得的信息为纳米结构和器件的操作提供了基本的见解。详细了解衬底电子结构对表面光子引发化学动力学的影响是本研究项目的重点。 在分析和表面化学项目的支持下，匹兹堡大学的Petek和Yates教授正在探索这些问题。 使用时间分辨的光电子能谱方法，结合从解吸离子角分布获得的结构信息，光子和电子引发的表面过程的动力学的基本理解。

This research project, with the support of the Analytical and Surface Chemistry Program, addresses questions of fundamental importance in the dynamics of adsorption and reaction on surfaces driven by photon and electron excitation. Professors Petek and Yates, at the University of Pittsburgh, combine femtosecond time resolved two photon photoemission with electron stimulated desorption ion angular distribution studies to probe the effects of substrate electronic structure on the detailed photochemistry of simple adsorbates on well characterized metal surfaces. Sulfur dioxide and carbon monoxide adsorbed on silver and platinum surfaces are the model systems of interest. Time resolved photoemission microscopy provides information about the effect of specific defect sites on the surface photochemical process. Information from these studies provides fundamental insight into the operation of nanoscale structures and devices. A detailed understanding of the effect of substrate electronic structure on the dynamics of photon initiated chemistry at surfaces is the focus of this research project. With the support of the Analytical and Surface Chemistry Program, Professors Petek and Yates at the University of Pittsburgh are probing these questions. Using time resolved photoemission methods, combined with structural information obtained from desorbed ion angular distributions, fundamental understanding of the dynamics of photon and electron initiated surface processes is obtained.