Photoionization dynamics of excited Ne, Ar, Kr and Xe atoms near threshold
Photoionization dynamics of excited Ne, Ar, Kr and Xe atoms near threshold
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DOI：
10.1088/0953-4075/45/9/092001
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发表时间：
2012-04
期刊：
影响因子：
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通讯作者：
V. L. Sukhorukov;I. Petrov;M. Schäfer;F. Merkt;M. Ruf;H. Hotop
中科院分区：
文献类型：
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作者：
V. L. Sukhorukov;I. Petrov;M. Schäfer;F. Merkt;M. Ruf;H. Hotop
本文综述了较重稀有气体原子阈值光电离的实验和理论研究，特别强调了从基态或激发态进入的最低两个电离阈值2 P ~（3/2）和2 P ~（1/2）之间光谱区的自电离共振。观察到的趋势的位置，宽度和形状的自电离共振取决于原子序数，主量子数n，轨道角动量量子数n和进一步的量子数指定的精细和超精细结构水平的总结和讨论的从头算和多通道量子亏损理论计算。还讨论了光电离谱对初始制备的中性态的依赖性，包括极化激发态的光电离截面和光电子角分布的结果。分析了在这些系统中光电离理论处理中各种近似的影响。非常大的多样性观察到的现象和众多的异常光谱结构与阈值电离的稀有气体原子可以描述在一组有限的相互作用和动力学过程。提供的例子说明的光电离的特征方面，和一套推荐的参数描述的能级结构和光电离动力学的稀有气体原子的提出了这是提取在一个非常大的机构的实验和理论数据，这些系统在文献中的批判性分析。
A review of experimental and theoretical studies of the threshold photoionization of the heavier rare-gas atoms is presented, with particular emphasis on the autoionization resonances in the spectral region between the lowest two ionization thresholds 2P3/2 and 2P1/2, accessed from the ground or excited states. Observed trends in the positions, widths and shapes of the autoionization resonances depending on the atomic number, the principal quantum number n, the orbital angular momentum quantum number ℓ and further quantum numbers specifying the fine- and hyperfine-structure levels are summarized and discussed in the light of ab initio and multichannel quantum defect theory calculations. The dependence of the photoionization spectra on the initially prepared neutral state are also discussed, including results on the photoionization cross sections and photoelectron angular distributions of polarized excited states. The effects of various approximations in the theoretical treatment of photoionization in these systems are analysed. The very large diversity of observed phenomena and the numerous anomalies in spectral structures associated with the threshold ionization of the rare-gas atoms can be described in terms of a limited set of interactions and dynamical processes. Examples are provided illustrating characteristic aspects of the photoionization, and sets of recommended parameters describing the energy-level structure and photoionization dynamics of the rare-gas atoms are presented which were extracted in a critical analysis of the very large body of experimental and theoretical data available on these systems in the literature.