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极紫外(extreme ultraviolet, XUV)光与物质相互作用是探索微观粒子内部结构的重要方式. 本文利用反应显微成像谱仪测量了Ne, Xe原子在XUV光作用下单电离与双电离的电子角分布, 提取了Ne原子2p电子和Xe原子5p, 5s电子电离的 β不对称参数, 并结合前人已发表的实验数据与不同的理论模型进行对比. 结果表明Ne原子2p壳层电子电离受电子关联效应影响较弱; Xe原子5p电子电离受电子关联效应影响强, 且不受相对论效应的影响, 但这两种效应在Xe原子5s电子电离过程中都发挥了重要作用. 此外, 研究还发现Xe原子双电离存在直接双电离和间接双电离两种机制, 并给出了间接双电离第一步与第二步光电子角分布与 β不对称参数信息.The interaction of extreme ultraviolet (XUV) photon with matter is a meaningful way to understand the electronic structure of microscopic particles. In this paper, the electron angular distributions of single ionization and double ionization of Ne and Xe atoms interacting with XUV photons are investigated by utilizing a reaction microscope. The β-asymmetric parameters of 2p electrons of Ne atom, and 5p, 5s electrons of Xe atom combined with the reported experimental data are compared with those from different theoretical models. The result shows that the electron correlation effect can be ignored in the ionization of 2p electron of Ne atom. While the ionization of 5p electron of Xe atom is strongly influenced by the electron correlation effect, but not by the relativistic effect. These two effects play an important role in ionizing the 5s shell of Xe atom. In addition, this study finds that both direct double ionization and indirect double ionization exist simultaneously during the ionization of Xe atom, and gives the photoelectron angular distributions and the β-asymmetric parameters of the first step and the second step of indirect double ionization.
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Xe+电子组态 总角动量J 能量/eV 能峰序号 5p5 P3/2 12.10 (1) P1/2 13.40 (2) 5s5p6 S1/2 23.30 (3) 5s25p4(3P)6p 2D3/2 27.54 (4) 5s25p4(3P)5d 2D5/2 5s25p4(1D)5d 2P1/2 27.88 5s25p4(1D)5d 2D3/2 27.97 5s25p4(1S)6s 2S1/2 28.16 
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