Polarization transfer in x-ray transitions due to photoionization in highly charged copper-like ions

Abstract

Using the density matrix theory and the multi-configuration Dirac-Fock method, the d 3 3 2 subshell photoionization of highly charged ions is studied, together with their subsequent radiative decay. The effects of polarization transfer on the linear polarization and angular distribution of the  d s D d p P 3 4 3 4 9 2 2 3 2 10 2 1 2 characteristic line photoemission for selected Cu-like Zn + , Ba 27+ , + W 45 , and + U 63 ions are investigated. Our results show that the polarization transfer, arising from the originally polarized incident light, may lead to a considerable change in the alignment parameters and the polarization properties of the radiation, the character of which is highly sensitive to the initial photon polarization, yet virtually independent of the photon energy. These characteristics are very similar to those of the electron bremsstrahlung process reported by Märtin et al (2012 Phys. Rev. Lett. 108 264801). The present results are compared with available experimental results and show a good quantitative agreement.

Relaxation effects on the magnetic cross section and fluorescence radiation polarization after 4d inner-shell photoionization of Ba-like ions

“…For 4d inner-shell PI of Ba-like ions, the residual ions during the de-excitation radiation process will generate the electrical quadrupole (E2) transition line 4d 5/2 → 6s 1/2 and the magnetic dipole (M1) transition line 4d 3/2 → 6s 1/2 . According to the density matrix theory [43,44], the linear polarization of the fluorescence radiation can be written as [49,50]…”

Dominance of the density effects in the magnetic sublevel population and circular polarization of x-ray radiation

“…The polarization of x-ray line emission from highly charged ions undergoing collisions with an electron beam provides a powerful window on electron-electron interactions in strong Coulomb fields and results in manifestations exploited in multiple branches of physics [1][2][3][4][5][6][7][8][9]. This fact has recently received increased attention because of its diagnostic potential for ascertaining the existence of directional electrons in laboratory and astrophysical plasmas [10][11][12].…”

Theoretical calculations on photoelectron angular distribution of sequential two-photon double ionization for Ar atom

“…Gryzlova等 [16] 在电偶极近似下, 对圆极化光的序列双光双电离过程中第二个光电 子的角分布以及两个光电子的关联函数进行了计 算研究, 结果表明入射光的极化性质对光电离通道 有着较大的影响, 尤其是在Cooper极小位置处影 响最大. Grum-Grzhimailo等 [17,18] [20] 、光电子角分布 [21] 、内壳层光电离后退激辐射 光的极化和角分布 [22,23] 等方面. 单光单电离的物 理过程可以用(1)式表示:…”