Many-Body Theory of Charge Transfer in Hyperthermal Atomic Scattering

高温原子散射中电荷转移的多体理论

• 批准号: 9313856
• 负责人: John Marston
• 金额: $ 9万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-02-15 至 1997-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9313856&HistoricalAwards=false
• 关键词: Many; Body; Theory; Charge; Transfer

9313856 Marston Electronic many-body processes play an important role in charge transfer between hyperthermal (greater than thermal velocity) atoms and the surfaces off which they scatter. Many-body correlations are intrinsic to any theory of dynamical charge transfer which includes electron spin, multiple charge and excited atomic states. This proposal focusses on these correlations and tries to model specific real systems. Understanding the roles of Auger processes, electron-electron interactions in the atom and the substrate and the limitations of present models and their systematic solution are some of the principal problems to be addressed. Complicated (more complex than alkali metal) impinging atoms such as oxygen and semiconducting target surfaces are to be studied. %%% This work has direct significance in the understanding of interactions at surfaces - eg the glow of atoms and molecules bombarding the space shuttle in orbit. It concerns the many-body description of how high energy atoms scatter off surfaces. The work makes use of recent innovations in field theory to deal with these dynamical strongly correlated electronic systems. The proposal concerns treating non-trivial impinging atoms and non-trivial surfaces - where the qualifiers here mean that their electronic structure has to be handled by sophisticated methods. ***

9313856马斯顿电子多体过程在过热（大于热速度）原子和它们散射的表面之间的电荷传递中起重要作用。多体关联是任何动态电荷转移理论所固有的，包括电子自旋、多电荷和原子激发态。本建议关注这些相关性，并尝试对具体的实际系统进行建模。了解俄歇过程的作用，原子和衬底中的电子-电子相互作用，现有模型的局限性及其系统解决方案是需要解决的一些主要问题。复杂的（比碱金属更复杂的）撞击原子，如氧和半导体靶表面将被研究。这项工作对理解表面的相互作用有直接意义，例如原子和分子的辉光轰击轨道上的航天飞机。它涉及到高能原子如何从表面散射的多体描述。这项工作利用了场理论的最新创新来处理这些动态的强相关电子系统。这个提议涉及到处理非平凡的碰撞原子和非平凡的表面——这里的限定词意味着它们的电子结构必须用复杂的方法来处理。＊＊＊