Angular distribution of L characteristic X-ray emission from Au target impacted by photons
文献类型：期刊论文
| 作者 | Liu Yu1,2,3; Xu Zhong-Feng1; Wang Xing1; Hu Peng-Fei1; Zhang Xiao-An2,3 |
| 刊名 | ACTA PHYSICA SINICA
 |
| 出版日期 | 2020-06-20 |
| 卷号 | 69期号:12页码:6 |
| 关键词 | photoionization characteristic X-rays angular distribution anisotropy parameter |
| ISSN号 | 1000-3290 |
| DOI | 10.7498/aps.69.20191977 |
| 通讯作者 | Liu Yu(liuyuxianyang0625@126.com) |
| 英文摘要 | The vacancy can be produced through impact ionization of target atom by energetic particles. It is of significant importance to study the vacancy state by the measurement of angular distribution of typical X-rays. At present, accurate ionization cross-section data of the atomic inner shell are urgently required in many areas. However, the precise measurement of ionization cross-section of the atomic inner shell is largely dependent on the fact that whether the characteristic radiation (e.g., X-ray) is isotropic. In this experiment, the characteristic L-iota, L-alpha, L-beta and L-gamma 1 X-rays for Au target are measured by a silicon drift detector in an emission angle range from 130 degrees to 170 degrees in steps of 10 degrees. A mini-X ray source is utilized to produce bremsstrahlung with the center energy of 13.1 keV. Considering detection efficiency of the detector and the absorption of the target, relative intensity ratios, I(L-alpha)/I(L-gamma 1) and I(L-iota)I(L-gamma 1), are obtained at different detection angles based on the experimental energy spectrum results. Moreover, the angular dependence of X-ray intensity ratio is investigated and it is found that the X-rays L-iota and L-alpha exhibit anisotropic emission. According to the X-ray intensity ratio I(L-iota)//(L-gamma 1) and the P-2(cos theta), and using the least square method, the anisotropic parameter beta of characteristic X-ray L-iota is derived to be 0.25. Due to the relation beta = alpha kappa A(20), the value of the alignment degree A(20) for L-3 sub-shell is determined to be 0.577 +/- 0.08. Alignment degree A(20) for L-3 sub-shell is dependent on its intrinsic physical properties, while the anisotropy parameter beta of typical X-rays can be affected by Coster-Kronig transition process. The behavior of the alignment for inner-shell vacancy states calls for more research results both in theory and in experiment. Therefore, it is quite relevant and meaningful to perform more experiments to further study the angular distribution of vacancy states by electrons, photons and ions impacting a target. |
| WOS关键词 | PRODUCTION CROSS-SECTIONS ; AUGER ; DEPENDENCE ; PHOTOIONIZATION ; POLARIZATION ; ALIGNMENT |
| 资助项目 | National Natural Science Foundation of China[11875219] ; National Natural Science Foundation of China[11405123] ; Natural Science Basic Research Plan in Shaanxi Province of China[2018JM1027] ; Natural Science Basic Research Plan in Shaanxi Province of China[2019JQ-493] ; Special Scientific Research Program Funded by Shaanxi Provincial Education Department, China[19JK0928] ; Natural Science Foundation of Xianyang Normal University, China[XSYK17008] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000560743400004 |
| 出版者 | CHINESE PHYSICAL SOC |
| 资助机构 | National Natural Science Foundation of China ; Natural Science Basic Research Plan in Shaanxi Province of China ; Special Scientific Research Program Funded by Shaanxi Provincial Education Department, China ; Natural Science Foundation of Xianyang Normal University, China |
| 源URL | [http://119.78.100.186/handle/113462/139862]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Liu Yu |
| 作者单位 | 1.Xi An Jiao Tong Univ, Sch Sci, Xian 710049, Peoples R China 2.Xianyang Normal Univ, Ion Beam & Opt Phys Lab, Xianyang 712000, Peoples R China 3.Chinese Acad Sci, Inst Modern Phys, Xianyang 712000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu Yu,Xu Zhong-Feng,Wang Xing,et al. Angular distribution of L characteristic X-ray emission from Au target impacted by photons[J]. ACTA PHYSICA SINICA,2020,69(12):6. |
| APA | Liu Yu,Xu Zhong-Feng,Wang Xing,Hu Peng-Fei,&Zhang Xiao-An.(2020).Angular distribution of L characteristic X-ray emission from Au target impacted by photons.ACTA PHYSICA SINICA,69(12),6. |
| MLA | Liu Yu,et al."Angular distribution of L characteristic X-ray emission from Au target impacted by photons".ACTA PHYSICA SINICA 69.12(2020):6. |
入库方式： OAI收割
来源：近代物理研究所
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