Interaction of Low-Energy Positrons with Atoms and Molecules

低能正电子与原子和分子的相互作用

• 批准号: 0244653
• 负责人: Clifford Surko
• 金额: $ 92.06万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0244653&HistoricalAwards=false
• 关键词: Interaction; Low; Energy; Positrons; Atoms

This project focuses on the interaction of low-energy positrons with atoms and molecules, using a high-resolution, trap-based positron beam and complementary techniques to study scattering and annihilation processes. Positron-impact scattering processes to be studied include the vibrational excitation of molecules, and electronic excitation, ionization, positronium formation, and resonance phenomena in both atoms and molecules. Emphasis will be placed upon high energy-resolution measurements and studies at low values of positron energy, including the investigation of a variety of near-threshold processes. While focusing on research in atomic physics, this project has broader impacts in a number of areas. This research actively involves graduate students and post-doctoral researchers, including members of underrepresented groups, at all levels from the planning of experiments to the dissemination of research results.

该项目的重点是低能正电子与原子和分子的相互作用，使用高分辨率，基于陷阱的正电子束和补充技术来研究散射和湮灭过程。正电子碰撞散射过程的研究包括分子的振动激发，电子激发，电离，正电子素的形成，以及原子和分子中的共振现象。重点将放在高能量分辨率的测量和研究，在低价值的正电子能量，包括调查的各种近阈值的过程。该项目虽然侧重于原子物理学研究，但在许多领域具有更广泛的影响。这项研究积极吸收研究生和博士后研究人员，包括代表性不足群体的成员，参与从实验规划到研究成果传播的各个层面。