Collision Induced Surface Processes

9318636 Ceyer多相反应的详细动力学知识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处于同一基础上。 这个研究项目，在分析和表面化学计划的支持下，旨在获得这种详细的信息。 气相物质与表面碰撞所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和吸附在表面上的物质，作为入射分子的平移能的函数。 乙烯在镍表面上的氢化和氢原子填充到镍样品的本体中是两个过程，这将被详细探讨。 电子能量损失谱将用于识别可能的反应产物和表面中间体，这可能是由于碰撞引起的表面化学。 对表面化学反应动力学的基本了解对于我们发展对许多技术上重要的表面过程的理解是重要的，例如多相催化和电子材料加工。 这种基本的理解可以通过探索基本表面反应过程的动力学，使用分子动力学方法来研究气相反应得到最好的。 该项目解决了碰撞活化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，理解表面化学过程的框架将发展。 ***

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. ***