Clusters and Atomic Interaction on Crystal Surfaces

晶体表面上的团簇和原子相互作用

• 批准号: 8722519
• 负责人: Gert Ehrlich
• 金额: $ 44.93万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-05-01 至 1991-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8722519&HistoricalAwards=false
• 关键词: Clusters; Atomic; Interaction; Crystal; Surfaces

The ability of the field ion microscope to routinely visualize individual atoms on a crystal will be utilized to quantitatively characterize different aspects of metal clusters on metal surfaces: a. Atomic Interactions and Cohesion of Clusters From measurements of the equilibrium pair distribution function, the interactions between two atoms will be determined on smooth planes of bcc as well as fcc metals. Experiments on different adatoms and on different surfaces will explore chemical and structural effects on the interactions. b. Cluster Formation and Mobility The growth and structural transformations of metal clusters will be examined on densely packed planes of fcc and bcc metals. Diffusion of clusters will be studied to establish uder what conditions motion of the cluster as a whole dominates its mobility. c. Chemical Reactivity of Clusters If time permits, the ability of metal clusters, characterized by field ion microscopy, to catalyze dissociative chemisorption will be tested on smooth planes on which chemisorption is otherwise slow.//

场离子显微镜常规观察的能力 晶体上的单个原子将被用来定量地 表征金属上金属簇的不同方面 表面： a.原子间相互作用与团簇凝聚 根据平衡对分布函数的测量， 两个原子之间的相互作用将在光滑 bcc和fcc金属的平面。 不同的实验 吸附原子和不同的表面将探索化学和 结构对相互作用的影响。 B. 集群的形成与迁移 金属团簇的生长和结构转变 在fcc和bcc金属的密集堆积平面上进行检查。 将研究团簇的扩散，以确定 条件运动的集群作为一个整体占主导地位， 迁移率 C. 团簇的化学反应性 如果时间允许，金属簇的能力，其特征在于， 场离子显微镜，催化解离化学吸附， 在光滑的平面上进行测试，否则化学吸附 慢。//