(e,2e) and laser assisted electron impact studies of helium ionization

(e,2e) 和激光辅助氦电离电子撞击研究

• 批准号: 0555541
• 负责人: Nicholas L.S. Martin
• 金额: $ 37.38万
• 依托单位: University of Kentucky Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-07-01 至 2010-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0555541&HistoricalAwards=false
• 关键词: 2e; laser; assisted; electron; impact

This experimental research program is aimed at studies of electron-impact ionization of atomic helium. One experiment will measure electron angular distributions of the two electrons, one the incoming electron and one the electron from the ionization, scattered from the atom over a full 360 degrees. Data will be taken in the region of the helium autoionizing states (excited states of atoms that decay by emission of particles rather than light), both on and off resonance. The results are expected to add new insight into a postulated double scattering mechanism. A second experiment will investigate helium autoionization in the presence of a laser field. Ejected electron spectra will be measured which will contain sidebands separated from the normal autoionization peaks by energies equal to integral numbers of the photon energy. The broader impact of the program involves student education.

该实验研究计划旨在研究原子氦气的电子障碍电离。一个实验将测量两个电子的电子角分布，一个是传入的电子，一个来自电离的电子分布在整个360度上散布在原子上。 数据将在氦气自动化状态的区域（通过颗粒的发射而不是光衰减的原子激发态）在内外共振。预计结果将为假定的双散射机制增加新的见解。第二个实验将在存在激光场的情况下研究氦自由度。将测量喷射的电子光谱，该光谱将包含与正常自动离子峰分离的边带，该侧带，通过等于光子能量的积分数量的能量。该计划的更广泛影响涉及学生教育。