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

该奖项为一个为期两年的合作社提供支持 Joachim Burgdorfer教授和 Stuart B Elston教授，物理学和天文学系， 田纳西大学和量子物理小组 日本京都大学工学部，由 万波彦教授 该项目的目的是 进行一个合作的理论和实验 快速带电粒子碰撞相互作用的研究 价电子靠近表面。 从干净的散射 在掠射角处轮廓分明的表面提供了 研究大撞击碰撞过程的机会 参数，从而强调与价的相互作用 电子在表面附近，同时抑制 离子核的贡献。 该项目将涉及 首先，理论和实验研究， 射出的护航电子的能量和角分布 在掠射角离子表面碰撞中， 弹丸装药状态和速度，以及表面结构 和组成。 第二，计算机模拟 将产生散射离子的反射，特别是 着重于电子抛射体的同时演化 态和价电子的动力学响应。 最后，本文对该系统进行了理论和实验研究。 产生的护航电子的产额和角分布 通过通道快速离子将被执行。 各工作组的工作有很大的重叠， 京都大学和田纳西大学，与 在理论和实验两方面的能力互补。 例如，在美国， 电子输运的蒙特-卡罗模拟经验 在固体中，京都小组已经开发了一种模拟方法， 固体表面离子散射的代码。 这个项目 应提供有关贡献的详细新信息 离域电子的激发过程，对 传导电子的集体响应及其影响 二次电子发射，更广泛地说， 非弹性碰撞过程作为一种工具， 表面诊断

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.