类钠离子光电子角分布的非偶极效应

发布时间：2018-03-11 06:46

本文选题：类钠离子　切入点：光电子角分布　出处：《物理学报》2017年04期 　论文类型：期刊论文

【摘要】：基于密度矩阵理论和多组态Dirac-Fock方法,系统地研究了不同入射光子能量下类钠离子(20 Z92)3s,2p_(1/2)和2p_(3/2)子壳层的光电离过程,讨论了辐射场与电子相互作用的多极项对光电子角分布的影响,并给出了光电子角分布的偶极和非偶极参数.结果表明,非偶极项对光电子角分布的影响不仅与入射光子能量有关,而且与靶离子的原子序数、被电离电子的壳层等有着密切的关系.总体上,非偶极项对2p_(1/2,3/2)子壳层光电子角分布的影响大于对3s子壳层光电子角分布的影响;电偶极近似下,入射光子能量、靶离子核电荷数对s子壳层光电子角分布轮廓影响不大,对p子壳层光电子角分布影响较大,在高能光子入射下,低Z离子的p子壳层光电子角分布出现反常的角分布情况;考虑非偶极项之后,p子壳层的反常光电子角分布消失.
[Abstract]:Based on the density matrix theory and the multi-configuration Dirac-Fock method, the photoionization processes of the subshells of 20 Z92s-1 / 2 and 2pSP / 2) subshells with different incident photon energies are systematically studied. The effect of the multipolar term of the interaction between the radiation field and the electron on the photoelectron angular distribution is discussed. The dipole and non-dipole parameters of the photoelectron angular distribution are given. The results show that the influence of the non-dipole term on the photoelectron angular distribution is not only related to the incident photon energy, but also to the atomic number of the target ions. In general, the influence of non-dipole term on the angular distribution of photoelectrons in the subshell is greater than that on the photoelectron angular distribution in the subshell of 3s, and the incident photon energy is greater in the electric dipole approximation than in the case of the photoelectron angle distribution in the subshell of the subshell of the 3s shell, and the effect of the non-dipole term on the angular distribution of the photoelectron in the subshell is greater than that in the subshell. The number of target ion nuclear charge has little effect on the photoelectron angular distribution profile of s subshell layer, but has a great influence on p subshell photoelectron angular distribution. Under the high energy photon incidence, the p subshell photoelectron angular distribution of low Z ion appears abnormal angular distribution. The anomalous photoelectron angular distribution of the subshell disappears after the non-dipole term is considered.
【作者单位】：黄山学院信息工程学院;西北师范大学物理与电子工程学院甘肃省原子分子物理与功能材料重点实验室;
【基金】：国家自然科学基金(批准号:11274254,U1332206,U1331122,11464042,11564036) 安徽省高校优秀青年人才支持计划重点项目(批准号:gxyq ZD2016301) 安徽省高校自然科学研究项目(批准号:KJHS2015B01) 黄山学院自然科学研究项目(批准号:2016xskq003)资助的课题~~
【分类号】：O562

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