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arXiv 2501.03043physics.atom-ph
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类氦 B$^{3+}$ 离子单光电离中的双-$K$-空穴共振

Double-$K$-hole resonances in single photoionization of He-like B$^{3+}$ ions

A. Müller, P. -M. Hillenbrand, S. -X. Wang, S. Schippers, E. Lindroth, F. Trinter, J. Seltmann, S. Reinwardt, M. Martins, A. S. Kheifets, I. Bray

备注：
27 pages, 19 figures
发表信息：
Phys. Rev. A 110, 062802 (2024)
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AI总结：

本研究结合高分辨实验与多体理论，观测类氦 B$^{3+}$ 单光电离中的两类双-$K$-空穴共振系列，并用 CCC 等方法精确给出共振能及直接/共振电离截面。

摘要：

在一项实验与理论联合研究项目中，于约250至1200 eV的能量范围内研究了类氦 B$^{3+}$ 离子的单光电离。实验中的母离子束同时包含 $1s^2~^1S$ 基态和 $1s2s~^3S$ 亚稳态 B$^{3+}$ 离子，因此可以研究双芯空穴共振。观测到两个空心共振态系列：一个由 $K$ 壳层双激发 $1s^2~^1S \to 2\ell n\ell'~^1P$（$\ell=s,p$；$\ell'=p,s$；$n=2,3,..,6$）在最高约510 eV的光子能量下布居，另一个由 $K$ 壳层单激发 $1s2s~^3S \to 2\ell n\ell'~^3P$（$\ell=s,p$；$\ell'=p,s$；$n=2,3,..,6$）在最高约310 eV的能量下布居。实现了高达约29000的高分辨本领。采用相对论多体微扰理论确定 $K$ 壳层激发及随后自电离的逐能级截面。共振能量的计算纳入了电子关联和辐射贡献。最显著共振的能量不确定度估计低于 $\pm1$ meV。收敛密耦（CCC）计算给出了 B$^{3+}$ 的单光电离截面 $\sigma_{34}$，包括共振和非共振通道。除共振外，在所研究能量范围内，$\sigma_{34}$ 由直接电离主导。后一过程对 $\sigma_{34}$ 的贡献 $\sigma_{34}^{\mathrm{dir}}$ 通过含交换的无规相近似和相对论 Hartree-Fock 计算单独确定，二者与以往计算吻合得很好。一个电子的直接电离并伴随剩余电子激发由 CCC 理论处理，发现其对 $\sigma_{34}$ 的贡献较小。

英文摘要：

Within a joint experimental and theoretical research project, single photoionization of He-like B$^{3+}$ ions was investigated in the energy range from approximately 250 to 1200~eV. With the parent-ion beam in the experiment containing both $1s^2~^1S$ ground-state and $1s2s~^3S$ metastable B$^{3+}$ ions, double-core-hole resonances could be studied. Two series of hollow resonant states were observed, one populated by $K$-shell double excitation $1s^2~^1S \to 2\ell n\ell'~^1P$ ($\ell=s,p$; $\ell'=p,s$; $n=2,3,..,6$) at photon energies up to about 510~eV, the other by $K$-shell single excitation $1s2s~^3S \to 2\ell n\ell'~^3P$ ($\ell=s,p$; $\ell'=p,s$; $n=2,3,..,6$) at energies up to about 310~eV. High resolving powers up to approximately 29000 were achieved. The relativistic many-body perturbation theory was employed to determine level-to-level cross sections for $K$-shell excitation with subsequent autoionization. The resonance energies were calculated with inclusion of electron correlation and radiative contributions. The energy uncertainties of the most prominent resonances are estimated to be below $\pm 1$ meV. Convergent close coupling (CCC) calculations provided single-photoionization cross sections $σ_{34}$ for B$^{3+}$ including the resonant and non-resonant channels. Apart from the resonances, $σ_{34}$ is dominated by direct ionization in the investigated energy range. The contribution $σ_{34}^{\mathrm{dir}}$ of the latter process to $σ_{34}$ was separately determined by using the random-phase approximation with exchange and relativistic Hartree-Fock calculations which agree very well with previous calculations. Direct ionization of one electron accompanied by excitation of the remaining electron was treated by the CCC theory and found to be a minor contribution to $σ_{34}$.

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