https://doi.org/10.1140/epjd/e2018-90058-2
Regular Article
Angular distribution and polarization of X-ray radiation in highly charged He-like ions: hyperfine-induced transition
1
School of Science, Hunan University of Technology,
Zhuzhou
412007, P.R. China
2
Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University,
Lanzhou
730070, P.R. China
3
College of Science, National University of Defense Technology,
Changsha
410073, P.R. China
a e-mail: chenzhanbin008@qq.com
b e-mail: dongcz@nwnu.edu.cn
Received:
9
February
2018
Received in final form:
4
April
2018
Published online: 5
June
2018
The angular distribution and polarization properties of the X-rays produced by the hyperfine-induced transition are investigated within a fully relativistic distorted-wave approximation. The calculations are performed for the 1s2p3∕2 3P2Fi = 3/2 → 1s2 1S0Ff = 1/2 component of the Kα1 decay for highly charged He-like 119Sn48+ and 207Tl79+ ions with nuclear spin I = 1/2 following impact excitations by an un-polarized and a completely longitudinally-polarized electron beam, respectively. The Breit interaction and mutipole mixing between the leading M2 decay and the hyperfine-induced E1 decay corrections to both linear and circular polarizations of the emitted X-ray radiations are evaluated. All these effects are found to be significant and may potentially explain the disagreement between the theories and experiments related to the polarization properties of the X-ray radiation.
Key words: Atomic and Molecular Collisions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2018