电子与激光冷却并俘获的亚稳态氦原子的碰撞：总散射截面

Electron collisions with laser cooled and trapped metastable helium atoms: total scattering cross sections.

作者信息

Uhlmann L J, Dall R G, Truscott A G, Hoogerland M D, Baldwin K G H, Buckman S J

机构信息

Atomic and Molecular Physics Laboratories, Research School of Physical Sciences and Engineering, Australian National University, Canberra, Australian Capital Territory 0200, Australia.

出版信息

Phys Rev Lett. 2005 May 6;94(17):173201. doi: 10.1103/PhysRevLett.94.173201. Epub 2005 May 3.

DOI:10.1103/PhysRevLett.94.173201

PMID:15904286

Abstract

Absolute measurements of total scattering cross sections for low energy (5-70 eV) electrons by metastable helium (2(3)S) atoms are presented. The measurements are performed using a magneto-optical trap which is loaded from a laser-cooled, bright beam of slow He(2(3)S) atoms. The data are compared with predictions from convergent close coupling and R matrix with pseudostate calculations, and we find good agreement between experiment and theory.

摘要

本文给出了亚稳态氦（2(3)S）原子对低能（5 - 70电子伏特）电子的总散射截面的绝对测量结果。测量是使用磁光阱进行的，该磁光阱由激光冷却的慢He(2(3)S)原子的明亮束流加载。将数据与收敛密耦和含赝态计算的R矩阵的预测结果进行了比较，我们发现实验与理论之间吻合良好。