Collision Induced Surface Processes

碰撞引起的表面处理

• 批准号: 9318636
• 负责人: Sylvia Ceyer
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-02-01 至 1998-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9318636&HistoricalAwards=false
• 关键词: Collision; Induced; Surface; Processes

9318636 Ceyer A knowledge of the detailed dynamics of heterogeneous reactions will put our understanding of surface reaction chemistry on the same footing as our detailed understanding of elementary gas phase reaction processes. This research project, supported in the Analytical and Surface Chemistry Program, is designed to obtain this sort of detailed information. Surface processes which are induced by the collision of gas phase species with the surface are the focus of the work of this project. Molecular beam methods will be used to investigate the reaction of molecules with the surface and species adsorbed on the surface, as a function of the translational energy of the incident molecule. The hydrogenation of ethylene on the nickel surface and the packing of hydrogen atoms into the bulk of the nickel sample are two processes which will be explored in detail. Electron energy loss spectroscopy will be used to identify possible reaction products and surface intermediates which may result from the collision induced surface chemistry. %%% The basic understanding of the dynamics of surface chemical reactions is important for our developing understanding of many technologically important surface processes such as heterogeneous catalysis and electronic materials processing. This basic understanding can best be obtained by exploring the dynamics of elementary surface reaction processes using the molecular dynamics methods developed to examine gas phase reactions. This project addresses the specific question of collision activated surface chemistry, using variable energy molecular beam studies to probe important model systems. From this detailed experimental information, a framework for understanding surface chemical processes will develop. ***

9318636 Ceyer了解非均相反应的详细动力学将使我们对表面反应化学的理解与对基本气相反应过程的详细理解处于相同的基础上。这项研究项目得到了分析和表面化学计划的支持，旨在获得这类详细信息。气相物质与表面碰撞产生的表面过程是本课题研究的重点。分子束方法将被用来研究分子与表面和吸附在表面上的物种的反应，作为入射分子平动能的函数。乙烯在镍表面的加氢和氢原子在镍样品中的填充是两个将被详细探讨的过程。电子能量损失谱将被用来确定可能的反应产物和表面中间体，它们可能是碰撞诱导的表面化学的结果。对表面化学反应动力学的基本了解对于我们发展理解许多重要的表面过程是很重要的，例如多相催化和电子材料加工。这种基本的理解可以通过使用分子动力学方法探索基本表面反应过程的动力学来获得，分子动力学方法是用来研究气相反应的。这个项目解决了碰撞激活表面化学的具体问题，使用可变能量分子束研究来探索重要的模型系统。根据这些详细的实验信息，将形成一个理解表面化学过程的框架。***