Autoionization resonances in the photoabsorption spectra of Fe ⁿ⁺ iron ions

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• 作者：A. V. Konovalov ; A. N. Ipatov
• 刊名：Journal of Experimental and Theoretical Physics
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：123
• 期：5
• 页码：752-761
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Particle and Nuclear Physics; Classical and Quantum Gravitation, Relativity Theory; Elementary Particles, Quantum Field Theory; Solid State Physics;
• 出版者：Pleiades Publishing
• ISSN：1090-6509
• 卷排序：123

文摘

The photoabsorption cross sections of a neutral iron atom, as well as positive Fe+ and Fe2+ ions, are calculated in the relativistic random-phase approximation with exchange in the energy range 20–160 eV. The wavefunctions of the ground and excited states are calculated in the single-configuration Hartree–Fock–Dirac approximation. The resultant photoabsorption spectra are compared with experimental data and with the results of calculations based on the nonrelativistic spin-polarized version of the random-phase approximation with exchange. Series of autoionization resonance peaks, as well as giant autoionization resonance lines corresponding to discrete transitions 3p → 3d, are clearly observed in the photoabsorption cross sections. The conformity of the positions of calculated peaks of giant autoionization resonances with experimental data is substantially improved by taking into account additionally the correlation electron–electron interaction based on the model of the dynamic polarization potential.