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| Journal Article | PUBDB-2024-07215 |
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2024
Inst.
Woodbury, NY
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Please use a persistent id in citations: doi:10.1103/PhysRevA.110.062802 doi:10.3204/PUBDB-2024-07215
Abstract: Within a joint experimental and theoretical research project, single photoionization of He-like B3+ ions was investigated in the energy range from approximately 250 to 1200 eV. With the parent-ion beam in the experiment containing both 1𝑠21𝑆 ground-state and 1𝑠2𝑠3𝑆 metastable B3+ ions, double-core-hole resonances could be studied. Two series of hollow resonant states were observed, one populated by 𝐾-shell double excitation 1𝑠21𝑆→2ℓ𝑛ℓ′1𝑃 (ℓ=𝑠,𝑝; ℓ′=𝑝,𝑠; 𝑛=2,3,⋯,6) at photon energies up to about 510 eV, the other by 𝐾-shell single excitation 1𝑠2𝑠3𝑆→2ℓ𝑛ℓ′3𝑃 (ℓ=𝑠,𝑝; ℓ′=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 ±1meV. Convergent close-coupling (CCC) calculations provided single-photoionization cross sections 𝜎34 for B3+ including the resonant and nonresonant channels. Apart from the resonances, 𝜎34 is dominated by direct ionization in the investigated energy range. The contribution 𝜎dir34 of the latter process to 𝜎34 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 𝜎34.
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