Northwest Normal University Institutional Repository (NWNU_IR)
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-Bin1,2,3; Dong Chen-Zhong1 | |
2018-10-05 | |
发表期刊 | 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 | |
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]. ACTA PHYSICA SINICA,2018,67(19). |
APA | Chen Zhan-Bin,&Dong Chen-Zhong.(2018).Hyperfine structure effect on circular polarization of X-ray radiation.ACTA PHYSICA SINICA,67(19). |
MLA | Chen Zhan-Bin,et al."Hyperfine structure effect on circular polarization of X-ray radiation".ACTA PHYSICA SINICA 67.19(2018). |
条目包含的文件 | 条目无相关文件。 |
个性服务 |
查看访问统计 |
谷歌学术 |
谷歌学术中相似的文章 |
[Chen Zhan-Bin]的文章 |
[Dong Chen-Zhong]的文章 |
百度学术 |
百度学术中相似的文章 |
[Chen Zhan-Bin]的文章 |
[Dong Chen-Zhong]的文章 |
必应学术 |
必应学术中相似的文章 |
[Chen Zhan-Bin]的文章 |
[Dong Chen-Zhong]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论