Out of scattering plane (e,2e) and laser assisted electron impact autoionization studies of helium

本实验研究项目旨在研究氦原子的电子碰撞电离。其中一个实验将测量两个电子的角分布，一个是入射电子，另一个是电离产生的电子，从原子散射到360度。数据将在氦自电离态(原子的激发态，通过发射粒子而不是光来衰减)的区域内获取，包括开启和关闭共振。这一结果有望为假设的双重散射机制提供新的见解。第二个实验将研究氦气在激光场中的自电离。射出的电子光谱将被测量，它将包含与正常的自电离峰分开的边带，其能量等于光子能量的整数。自电离峰的轮廓也预计会因激光的存在而改变。该项目更广泛的影响涉及到学生教育。学生学习激光、电子学、真空系统、计算机编程、网络和与实验交互的技能。他们在国内和国际会议上介绍他们的工作。

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 profile of the autoionization peaks are also expected to be modified by the presence of the laser. The broader impact of the program involves student education. Students acquire skills in lasers, electronics, vacuum systems, and computer programming, networking, and interfacing with experiments. They present their work at national and international conferences.