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multi-configuration Distorted-Wave Approximation in Electron-Impact Ionization of Ar^2＋

Chinese Physics Letters 2005年第10期22卷 2542-2545页

作者：曾思良李萍方泉玉邱玉波李月明颜君王建国 Key Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics PO Box 8009-57 Beijing 100088

A quasi-relativistic distorted-wave approximation is developed to investigate the direct electron-impact ionization processes, in which the configuration interactions are considered in the initial and final states of target. As an example, the direct detailed-level electron-impact ionization cross sections for the ground and low excited states of Ar^6＋（3s^2, 3p^2, 3s3d） are calculated in the energy range from 1.02 to 15Ith （ Ith the ionization threshold）. Comparison with the available data demonstrates that our results are reasonable. The effects of configuration interactions are discussed, and the validity of transformation principles by statistical weights between configuration-averaged and detailed-level electron-impact ionization cross sections is analysed.

关键词： multi-configuration Distorted-Wave Approximation

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Effects of electron correlation and the Breit interaction on one- and two-electron one-photon transitions in double K hole states of He-like ions(10 ≤ Z ≤ 47)

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Chinese Physics B 2020年第3期29卷 148-155页

作者： Xiaobin Ding Cunqiang Wu Mingxin Cao Denghong Zhang Mingwu Zhang Yingli Xue Deyang Yu Chenzhong Dong Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

The x-ray energies and transition rates associated with single and double electron radiative transitions from the double K hole state 2s2p to the 1s2s and 1s^2 configurations of 11 selected He-like ions(10 ≤ Z ≤ 47) are calculated using the fully relativistic multi-configuration Dirac–Fock method(MCDF). An appropriate electron correlation model is constructed with the aid of the active space method, which allows the electron correlation effects to be studied efficiently. The contributions of the electron correlation and the Breit interaction to the transition properties are analyzed in detail. It is found that the two-electron one-photon(TEOP) transition is correlation sensitive. The Breit interaction and electron correlation both contribute significantly to the radiative transition properties of the double K hole state of the He-like ions. Good agreement between the present calculation and previous work is achieved. The calculated data will be helpful to future investigations on double K hole decay processes of He-like ions.

关键词： electron correlation multi-configuration Dirac–Fock method(MCDF) double K hole state two-electron one-photon(TEOP)transition

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