U.S.-Japan Cooperative Research: Interactions of Swift Charged Particles with Valence Electrons Near Surfaces

美日合作研究：快带电粒子与近表面价电子的相互作用

• 批准号: 9016749
• 负责人: Joachim Burgdorfer
• 金额: $ 1.26万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-05-01 至 1993-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9016749&HistoricalAwards=false
• 关键词: U.S.; Japan; Cooperative; Research; Interactions

This award provides support for a two year cooperative research project between Professor Joachim Burgdorfer and Professor Stuart B Elston, Department of Physics and Astronomy, University of Tennessee, and the Quantum Physics Group at the Department of Engineering, Kyoto University, Japan, led by Professor Michi-hiko Mannami. The purpose of the project is to undertake a collaborative theoretical and experimental study of the collision interactions of fast charged particles with valence electrons near surfaces. Scattering from clean well defined surfaces at glancing angles provides the opportunity to study collision processes at large impact parameters, thereby accentuating interactions with valence electrons in the proximity of the surface while suppressing contributions from ionic cores. The project will involve firstly a theoretical and experimental investigation of the energy and angular distributions of convoy electrons ejected in glancing angle ion-surface collisions as a function of projectile charge state and velocity, and surface structure and composition. Secondly a computer simulation of the reflection of scattered ions will be developed, with particular emphasis on the simultaneous evolution of electron projectile states and the dynamical response of the valence electron. Finally a theoretical and experimental investigation of the yield and angular distribution of convoy electrons produced by channeled fast ions will be carried out. There is strong overlap between the work of the groups at Kyoto University and the University of Tennessee, with complementing capabilities in both theory and experiment. The group in the US, for example, have extensive numerical experience in Monte-Carlo simulations for electronic transport in solids, where as the Kyoto group have developed a simulation code for ionic scattering from solid surfaces. This project should provide detailed new information on the contribution of delocalized electrons to excitation processes, on the collective response of conduction electrons and its influence on secondary electron emission and, more broadly, on the usefulness of inelastic collision processes as a tool of surface diagnostics.

该奖项为田纳西大学物理与天文学系Joachim Burgdorfer教授和Stuart B Elston教授与日本京都大学工程系的量子物理小组之间的两年合作研究项目提供了支持。 该项目的目的是对快速电荷粒子与表面附近价电子的碰撞相互作用进行协作理论和实验研究。 从清洁明确的表面散射在瞥见角度为研究巨大的冲击参数研究碰撞过程提供了机会，从而在表面接近的同时抑制了离子核心的贡献，从而突出了与价电子的相互作用。 该项目将首先涉及对在扫视角离子地面碰撞中弹出的车队电子的能量和角度分布的理论和实验研究，这是弹丸电荷状态和速度以及表面结构和组成的函数。 其次，将开发出对散射离子反射的计算机模拟，特别强调了电子弹丸状态的同时进化和价电子的动力响应。 最后，将对通道快速离子产生的车队电子的产量和角度分布进行理论和实验研究。 京都大学和田纳西大学的团体工作之间存在很大的重叠，在理论和实验方面都具有补充能力。 例如，在美国，该组在固体中的电子传输中具有丰富的数值经验，因为京都群体已经开发了一种用于从固体表面的离子散射的模拟代码。 该项目应提供有关将电子电子对激发过程的贡献，传导电子的集体响应及其对二次电子发射的影响以及更广泛地对非弹性碰撞过程作为表面诊断工具的有用性的详细新信息。