Collision Induced Surface Processes

[9318636] Ceyer .对非均相反应的详细动力学的了解将使我们对表面反应化学的理解与我们对基本气相反应过程的详细理解相同。该研究项目由分析和表面化学项目支持，旨在获得此类详细信息。由气相物质与表面碰撞引起的表面过程是本项目工作的重点。分子束方法将用于研究分子与表面的反应以及表面上吸附的物质，作为入射分子平动能量的函数。乙烯在镍表面的加氢反应和氢原子在镍样品中的填充是两个将被详细探讨的过程。电子能量损失谱将用于识别可能由碰撞引起的表面化学反应产生的反应产物和表面中间体。对表面化学反应动力学的基本理解对于我们理解许多技术上重要的表面过程，如多相催化和电子材料加工，是很重要的。这种基本的理解可以通过使用用于检查气相反应的分子动力学方法来探索基本表面反应过程的动力学来获得。该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测重要的模型系统。从这些详细的实验信息中，将形成一个理解表面化学过程的框架。＊＊＊

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. ***