Polarization and Angular Distribution of L? X-Ray Following Inner-Shell 2p3/2 Photoionization of Magnesium-Like Ions
MA Kun1,2, DONG Chen-Zhong1**, XIE Lu-You1, DING Xiao-Bin1, QU Yi-Zhi3
1Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070 2School of Information Engineering, Huangshan University, Huangshan 245041 3College of Material Sciences and Opto-electronic Technology, University of the Chinese Academy of Sciences, Beijing 100049
Abstract：The inner-shell 2p3/2 photoionization and the subsequent decay of Mg-like Fe14+, Cd36+, W62+ and U80+ ions are studied theoretically within the multiconfiguration Dirac–Fock method and the density matrix theory. Special attention is paid to exploring the influence of the non-dipole terms which arise from the multipole expansion of the electron-photon interaction in the photoionization process. The results show that the non-dipole contribution to the total cross section, the magnetic sublevels cross section of the photoionization process, the degree of linear polarization and angular distribution of the subsequent characteristic x-ray radiation become more important with the increase of photons energy and atomic nuclear Z. Especially for the cross section and the degree of linear polarization, the non-dipole contribution arrives at 50% for U80+ at four time energy threshold units. However, for the angular distribution, the maximum contribution does not exceed 4%, even for U80+ ions.
2014, Vol. 31 
