Studies Involving Metastable Helium Atoms (Physics)

He(2.3S)亚稳态原子的新性质将成为本研究计划的主题。电子自旋标记技术将被用来探索光泵流动氦余辉装置中涉及He(2.3S)原子的Penning电离反应的动力学，该装置还将被用来研究极化电子与开壳层目标(如0.2)碰撞中的自旋交换。流动的氦余辉作为极化电子源的性能也将被研究，利用新开发的激光来光学定向He(2.3s)电子自旋。He(2.3s)自旋角动量守恒。在交叉束装置中，将利用与闭合壳层对的彭宁反应，为电子自旋偏振器的绝对校准提供一种新技术。将研究He(2.3s)原子在液氦表面的相互作用，期望He(2.3s)原子将被捕获在那里。将尝试通过自旋极化He(2.3S)原子来改变这些相互作用。

The novel properties of He (2.3S) metastable atoms will form the theme of this research program. Electron spin labelling techniques will be used to explore the dynamics of Penning ionization reactions involving He(2.3S) atoms in an optically pumped flowing helium afterglow apparatus, which will also be used to investigate spin exchange in collisions between polarized electrons and open shell targets such as 0.2. The performance of the flowing helium afterglow as a source of polarized electrons will also be investigated utilizing newly developed lasers to optically orient the He(2.3S) electron spins. Conservation of spin angular momentum in He(2.3S). Penning reactions with closed shell partners will be exploited in a crossed beam apparatus to provide a new technique for absolute calibration of electron spin polarimeters. The interactions of He(2.3S) atoms at a liquid helium surface will be investigated, with expectation that the He(2.3S) atoms will be trapped there. Attempts will be made to modify these interactions by spin polarizing the He(2.3S) atoms.