The Role of Substrate Band Structure in Photochemistry on Metal Surfaces

基底能带结构在金属表面光化学中的作用

• 批准号: 0209706
• 负责人: Hrvoje Petek
• 金额: $ 47万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-15 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0209706&HistoricalAwards=false
• 关键词: Role; Substrate; Band; Structure; Photochemistry

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.

这项研究项目在分析和表面化学计划的支持下，解决了由光子和电子激发驱动的表面吸附和反应动力学中的基本重要问题。匹兹堡大学的Petek和Yates教授将飞秒时间分辨双光子光电子能谱与电子刺激脱附离子角分布研究相结合，探索了衬底电子结构对简单吸附在特征良好的金属表面上的详细光化学的影响。吸附在银和铂表面的二氧化硫和一氧化碳是值得关注的模型体系。时间分辨光电子显微镜提供了特定缺陷位置对表面光化学过程的影响的信息。来自这些研究的信息为纳米级结构和设备的运作提供了基本的见解。详细了解衬底电子结构对表面光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，匹兹堡大学的佩泰克教授和耶茨教授正在探索这些问题。利用时间分辨光电子能谱方法，结合从解吸离子角分布获得的结构信息，对光子和电子引发的表面过程的动力学有了基本的了解。