Breit相互作用对类氦离子亚稳态1s2s ^3S1电子碰撞激发截面的影响

The effects of the Breit interaction on electronimpact excitation cross sections of the 1s2s ~3S_1metastable level of He-like ions

利用新近发展的基于全相对论扭曲波方法研究电子-离子碰撞激发过程的计算程序,通过对Breit相互作用的考虑,计算了类氦等电子序列离子从亚稳态1s2s 3S1激发2s电子到n=2,3壳层的电子碰撞激发截面;研究了不同入射电子能量时Breit相互作用对碰撞激发截面的影响,进一步总结了沿等电子序列变化时,Breit相互作用对截面影响的一般规律.部分计算结果与实验结果进行了比较,得到了很好的一致性.

The electron impact excitation（EIE） cross sections of He atom and He-like Fe^24＋ , Xe^52＋ and U^90＋ ions from the metastable 1s2s ^3S1 to all of 1snl（ n = 2,3; l = s, p, d） states are calculated systematically by using the fully relativistic distorted-wave （RDWB） program developed by our group recently. The effects of the Breit interaction on the EIE cross sections of He-like isoelectronic sequences ions at different energies of incident electrons is studied, and some important conclusions are summarized, which can be extended to other highly charged ions. Also, comparison of the present calculations for 1s2s ^3S1→1s2p ^3p and 1s2s ^3S1→1s3s ^3S1 with the available experimental results gave good agreement.