Influence of radiative cascades on the polarization and angular distribution of radiation following electron-impact excitation of He-like Fe24+ ions. (30th April 2015)

• Record Type: Journal Article
• Authors: Chen, Zhan-Bin; Dong, Chen-Zhong; Jiang, Jun
• Is Part Of: Physica scripta. Volume 90:Number 5(2015:May)
• Publication Date: 2015-04-30
• Subjects: cross section -- radiative cascades -- polarization; 34.80.Dp -- 34.80.Lx; Physics -- Periodicals; 530.05
• DOI: 10.1088/0031-8949/90/5/054007
• Languages: English
• ISSNs: 0031-8949

Abstract

Abstract: Detailed calculations are carried out for the electron-impact excitation cross sections from the ground state 1s 2 ( J = 0) to the individual magnetic sublevels of the excited state 1s2s1/2 ( J = 1) of highly charged He-like Fe 24+ ions using a fully relativistic distorted-wave method. The cascades contributions from high-lying levels 1s2p, 1s nl ( n = 3, 4, 5, 6; l = s, p, d) to the cross sections and the polarization properties of the 1s2s ( J = 0) line are investigated systematically. It is found that the 1s2p, 1s3 l, and 1s4 l ( l = s, p, d) excited states have significant effects and make the cross sections increase evidently. These dramatic influences also lead to a remarkable decrease in the linear polarization and angular distribution of subsequent x-ray radiation. The present results are in good agreement with the previous theoretical results and the polarization measurements performed at the Livermore electron beam ion trap.