Electron- and Photon-Induced Dynamics

电子和光子诱发动力学

• 批准号: 0855092
• 负责人: Gregory Miller
• 金额: --
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-15 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0855092&HistoricalAwards=false
• 关键词: Electron; Photon; Induced; Dynamics

Modern experimental techniques such as COLTRIMS (cold target recoil ion momentum spectroscopy) sometimes referred to as a 'reaction microscope', allow detailed measurements of the dynamics of the reaction. It is now possible to record in coincidence, both photoelectron angular distributions and the momenta of all charged molecular fragments. These studies are an excellent probe of the dynamics in the interaction of photons and electrons with molecules and the subsequent flow of energy between the vibrational modes of the system. These measurements pose a new challenge to theoretical predictions, but also an opportunity to understand these processes. This research program will study electron scattering from molecules and molecular ions and the subsequent dynamics following the collision. The calculations produce accurate and reliable cross sections, resonance parameters, and can describe in detail the nuclear dynamics following the electron collision. The systems that will be studied range from studies of dissociative recombination, which are critical in understanding the formation of molecules in interstellar clouds, dissociative excitation, which is important in low-temperature plasmas, such as combustion flames and the study of photoionization of polyatomic systems - predicting angular distributions from fxed-in-space molecules. All of this leads to a better understanding of these reactions, with an ultimiate goal of controlling the dynamics. This research will enhance infrastructure for research and education. It will be carried out at the Department of Applied Science, University of California, Davis, a multi disciplinary graduate program that houses faculty and students from a wide range of areas. The PI has strong collaborations with Lawrence Berkeley Lab. In addition, she maintains a strong collaboration with international partners, in particular the experimental effort at the CRYRING in Sweden, the TSR in Germany and with theoreticians at the Universite de Havre, France. Students from both these institutions have made long-term visits to work with the PI. These collaborations are on-going. In addition it will broaden participation of underrepresented groups. As one of the few faculty women in her college (and department), the PI acts as a mentor to new students, particularly women who are entering the program. Women, particularly women who are active in research, constitute one of the presently under represented groups in physics. The PI has and continues to serve as a role model for students. She has been the thesis adviser for several women students. The PI has been involved in classes whose purpose is to reach out to non-science majors on campus and give them some idea of what science is. For the past three years she has taught a Freshman seminar, "How to make a lens" which had a 50/50 enrollment of science vs non-science majors. In Spring 08, she taught an additional Freshman seminar, "How things work". The majority of the students were non-science majors. These seminars were very successful. In particular, the "How things work" was very popular with the students. This year, the PI taught a general education class entitled based on the seminar that was very well-received by the students. These students were mostly freshman and sophomore non-science majors.

现代实验技术，如COLTRIMS（冷靶反冲离子动量谱），有时被称为“反应显微镜”，允许详细测量反应的动力学。现在可以同时记录光电子的角分布和所有带电分子碎片的动量。这些研究是对光子和电子与分子相互作用的动力学以及随后系统振动模式之间的能量流动的一个很好的探测。这些测量对理论预测提出了新的挑战，但也为理解这些过程提供了机会。该研究计划将研究电子从分子和分子离子散射以及碰撞后的后续动力学。计算得到了精确可靠的截面和共振参数，并能详细描述电子碰撞后的核动力学。将被研究的系统范围从解离复合的研究，这是至关重要的理解分子在星际云的形成，解离激发，这是重要的低温等离子体，如燃烧火焰和多原子系统的光电离的研究-预测角分布从fxed-in-space分子。所有这些都有助于更好地理解这些反应，最终目标是控制动力学。这项研究将加强研究和教育的基础设施。它将在应用科学系，加州大学戴维斯分校，一个多学科的研究生课程，房子的教师和学生从广泛的领域进行。PI与劳伦斯伯克利实验室有着密切的合作。此外，她与国际合作伙伴保持着密切的合作，特别是在瑞典的实验室RING，德国的TSR以及法国阿弗尔大学的理论家的实验工作。这两个机构的学生都进行了长期访问，与PI合作。这些合作正在进行中。此外，它将扩大代表性不足群体的参与。作为她所在学院（和系）为数不多的女教师之一，PI担任新生的导师，特别是进入该项目的女性。妇女，特别是积极从事研究的妇女，是目前物理学中代表性不足的群体之一。PI已经并将继续作为学生的榜样。她曾担任几名女学生的论文指导老师。PI参与了一些课程，其目的是接触校园里的非理科专业学生，让他们对科学有一些了解。在过去的三年里，她教了一个新生研讨会，“如何使一个透镜”，其中有一个50/50的科学与非科学专业的招生。在08年春季，她教了一个额外的新生研讨会，“事情是如何工作的”。大多数学生都是非科学专业的。这些研讨会非常成功。特别是“事物是如何工作的”，非常受学生欢迎。今年，PI教授了一个基于研讨会的通识教育课程，受到学生的热烈欢迎。这些学生大多是大一和大二的非科学专业。