Hyperfine structure effect on circular polarization of X-ray radiation

doi:10.7498/aps.67.20180322

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	Hyperfine structure effect on circular polarization of X-ray radiation
其他题名	超精细结构效应对辐射光谱圆极化特性的影响
	Chen Zhan-Bin 1,2,3; Dong Chen-Zhong1
	2018-10-05
发表期刊	Wuli Xuebao/Acta Physica Sinica
ISSN	1000-3290
卷号	67 期号:19
摘要	During the last decades, the electron impact excitation (EIE) process has aroused much interest in various research areas. This process is crucial to the diagnoses of astrophysical and laboratory plasmas. Moreover, the EIE studies play an important role in understanding the quantum electrodynamic, many-electron, and hyperfine interaction effects in heavy atomic systems. As is well known, when ions are excited by collisions with a unidirectional beam of electrons, the magnetic sublevels of the excited state may be populated with nonstatistical probability. In the decay of the excited state, the emitted radiation is found to be anisotropic and polarized. From the analysis of the polarization, valuable information can be obtained. These properties have become indispensable tools for the diagnosis of plasma state and the analysis of complex spectrum formation mechanism. Up to now, however, most of studies have dealt with the linear polarization of X-ray radiation. Fewer publications have reported the circular polarization. Moreover, theoretical studies of the characteristic X-ray emission have just dealt with ions having zero nuclear spin, or have simply omitted all contributions that arise from such a spin. It is known that some kinds of ions each have a nuclear spin I≠0. Owing to the hyperfine coupling, new decay channel will be open, namely, hyperfine-induced transition. It is thus important to analyze how the hyperfine interaction affects the polarization properties of X-ray radiation. In this study, we present a systematically theoretical analysis of the polarization and angular distribution of X-ray radiation during the hyperfine-induced transition. The calculations are performed by using a fully relativistic distortedwave method. Special attention is paid to the studies of angular correlations and polarization properties of the 1s2p 3P2 Fi=3/2→1s21S Ff=1/2 decay for highly charged He-like Sc19+ and 205Tl79+ ions with nuclear spin I=1/2 following impact excitation by a completely longitudinally-polarized electron beam. Two effects, i. e. the BI and the mutipole mixing between the leading M2 decay and hyperfine-induced E1 decay, on the polarization of the emitted radiation are discussed. Our results show that both the BI and the E1-M2 interference effects may significantly affect the polarization and angular emission pattern of the transition line. For example, the BI and the E1-M2 mixing lead the circular polarization to increase by about 50% and 40% for 205Tl79+ ions, respectively. With the development of the X-ray detectors, the measurement on the polarization during the hyperfine-induced transition becomes feasible. We hope that the present results would be useful in resolving some disagreement between the theories and experiments relating to the polarization properties of the X-ray radiation. © 2018 Chinese Physical Society.
关键词	Angular distribution Circular polarization Decay (organic) Dynamic mechanical analysis Electrodynamics Electrons Excited states Impact ionization Induced polarization logging Ions Mixing Radiation effects Spin dynamics X rays Angular correlations Characteristic x rays Electron-impact excitation Hyperfine induced transitions Hyperfine interactions Interference effects Polarization properties Quantum electrodynamics
DOI	10.7498/aps.67.20180322
收录类别	EI ; SCIE
语种	中文
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000448517700013
出版者	Institute of Physics, Chinese Academy of Sciences
EI入藏号	20190206370044
EI主题词	X ray detectors
EI分类号	512.1.2 Petroleum Deposits : Development Operations ; 701 Electricity and Magnetism ; 711 Electromagnetic Waves ; 802.2 Chemical Reactions ; 802.3 Chemical Operations ; 931.3 Atomic and Molecular Physics ; 932.1 High Energy Physics
原始文献类型	Journal article (JA)
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.nwnu.edu.cn/handle/39RV6HYL/31889
专题	学校领导_学校领导学校领导实体学院_物理与电子工程学院科研机构_甘肃省原子分子物理与功能材料重点实验室
通讯作者	Chen Zhan-Bin
作者单位	1.Northwest Normal Univ, Key Lab Atom & Mol Phys & Funct Mat Gansu Prov, Coll Phys & Elect Engn, Lanzhou 730070, Gansu, Peoples R China; 2.Hunan Univ Technol, Sch Sci, Zhuzhou 412007, Peoples R China; 3.Natl Univ Def Technol, Coll Sci, Changsha 410073, Hunan, Peoples R China
第一作者单位	甘肃省原子分子物理与功能材料重点实验室
通讯作者单位	甘肃省原子分子物理与功能材料重点实验室
第一作者的第一单位	甘肃省原子分子物理与功能材料重点实验室
推荐引用方式 GB/T 7714	Chen Zhan-Bin,Dong Chen-Zhong. Hyperfine structure effect on circular polarization of X-ray radiation[J]. Wuli Xuebao/Acta Physica Sinica,2018,67(19).
APA	Chen Zhan-Bin,&Dong Chen-Zhong.(2018).Hyperfine structure effect on circular polarization of X-ray radiation.Wuli Xuebao/Acta Physica Sinica,67(19).
MLA	Chen Zhan-Bin,et al."Hyperfine structure effect on circular polarization of X-ray radiation".Wuli Xuebao/Acta Physica Sinica 67.19(2018).