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

该实验研究计划旨在研究氦原子的电子碰撞电离。一个实验将测量两个电子的电子角分布，一个是入射电子，另一个是来自电离的电子，从原子散射了整整360度。 数据将在氦自电离态（原子的激发态，通过粒子而不是光的发射而衰变）的区域中采集，包括共振和非共振。这些结果有望为假设的双散射机制提供新的见解。第二个实验将研究氦在激光场中的自电离。将测量喷射电子光谱，其将包含与正常自电离峰分开的边带，其能量等于光子能量的整数。该计划的更广泛影响涉及学生教育。

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.