Studies Involving Metastable Helium Atoms (Physics)

He（2.3S）亚稳原子的新性质将 形成了这个研究项目的主题。 电子自旋 标签技术将被用来探索的动力学 He（2.3S）原子的Penning电离反应 光泵流动氦余辉装置， 也可以用来研究自旋交换之间的碰撞 极化电子和开壳靶，例如0.2。 的 流动的氦余辉作为一个源的性能 极化电子也将研究利用新的 开发激光器来光学定向He（2.3S）电子 旋转 He（2.3S）自旋角动量守恒。 与封闭壳层伙伴的潘宁反应将被利用 在交叉束装置中，提供一种新技术， 电子自旋偏振仪的绝对校准。 的 He（2.3S）原子在液氦表面的相互作用将 研究，期望He（2.3S）原子将 被困在那里。 将尝试修改这些 通过自旋极化He（2.3S）原子的相互作用。

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.