Atomic Interactions, Overlayers, and Diffusion on Metals

金属上的原子相互作用、覆盖层和扩散

• 批准号: 9101429
• 负责人: Gert Ehrlich
• 金额: $ 44.4万
• 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: 1991
• 资助国家: 美国
• 起止时间: 1991-07-01 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9101429&HistoricalAwards=false
• 关键词: Atomic; Interactions; Overlayers; Diffusion; Metals

Interactions between adatoms on metal surfaces will be examined using the field ion microscope to investigate chemical and structural factors in pair interactions, many-atom interactions and overlayer stability, and interactions and surface diffusion. The dependence of pair energetics upon the chemical identity of the adatoms will be explored with pairs of palladium and gold atoms on tungsten. Measurements of cluster dissociation for iridium and palladium on tungsten will be combined with data on pair interactions to determine the role of many-atom effects in cohesion. Diffusion in a surface layer containing many adatoms will be studied by measuring the time correlation of concentration flucturations to establish the effects of interaction on the diffusivity.

将用场离子显微镜研究金属表面原子之间的相互作用，以研究成对相互作用、多原子相互作用和覆盖层稳定性以及相互作用和表面扩散中的化学和结构因素。配对能量学对原子的化学同一性的依赖将通过配对的钯和金原子在钨上进行探索。测量Ir和Pd在钨上的团簇解离将与对相互作用的数据相结合，以确定多原子效应在凝聚力中的作用。通过测量浓度波动的时间相关性来研究包含许多吸附原子的表层中的扩散，以确定相互作用对扩散系数的影响。