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arXiv 1907.12969physics.atom-ph
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钨离子的光电离:W $^{5+}$的实验和理论

Photoionization of tungsten ions: experiment and theory for W$^{5+}$

A Müller, S Schippers, J Hellhund, A L D Kilcoyne, R A Phaneuf, B M McLaughlin

摘要:

报道了W $^{5+}$离子单光子单电离的实验和理论截面。采用光子-离子合并束技术进行绝对测量。在20 - 160 eV范围内以(67 $\pm$ 10)~meV分辨率进行详细的光子能量扫描。与较低电荷态的钨离子的光电离相反,截面由窄的、密集间隔的共振主导。理论结果从一个Dirac-Coulomb R-矩阵的方法,采用一组基础的457个水平提供横截面的W $^{5+}$离子的光电离在$4f^{14}5s^2 5p^6 5d \; {^2}{\rm D}_{3/2}$地面水平,以及$4f^{14}5s^2 5p^6 5d \; {^2}{\rm D}_{5/2}$和$4f^{14}5s^2 5p^6 6s \; {^2}{\rm S}_{1/2}$亚稳态激发水平。考虑到低电荷态钨离子电子结构的复杂性,理论与实验符合得比较好。

英文摘要:

Experimental and theoretical cross sections are reported for single-photon single ionization of W$^{5+}$ ions. Absolute measurements were conducted employing the photon-ion merged-beams technique. Detailed photon-energy scans were performed at (67$\pm$10)~meV resolution in the 20 -- 160 eV range. In contrast to photoionization of tungsten ions in lower charge states, the cross section is dominated by narrow, densely-spaced resonances. Theoretical results were obtained from a Dirac-Coulomb R-matrix approach employing a basis set of 457 levels providing cross sections for photoionization of W$^{5+}$ ions in the $4f^{14}5s^2 5p^6 5d \; {^2}{\rm D}_{3/2}$ ground level as well as the $4f^{14}5s^2 5p^6 5d \; {^2}{\rm D}_{5/2}$ and $4f^{14}5s^2 5p^6 6s \; {^2}{\rm S}_{1/2}$ metastable excited levels. Considering the complexity of the electronic structure of tungsten ions in low charge states, the agreement between theory and experiment is satisfactory.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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