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@ARTICLE{Mller:618893,
      author       = {Müller, A. and Hillenbrand, Pierre-Michel and Wang,
                      Shuxing and Schippers, S. and Lindroth, Eva and Trinter, F.
                      and Seltmann, J. and Reinwardt, Simon and Martins, M. and
                      Kheifets, A. S. and Bray, I.},
      title        = {{D}ouble-{K}-hole resonances in single photoionization of
                      {H}e-like ${B}^{3+}$ ions},
      journal      = {Physical review / A},
      volume       = {110},
      number       = {6},
      issn         = {2469-9926},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {PUBDB-2024-07215},
      pages        = {062802},
      year         = {2024},
      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 1⁢𝑠21𝑆 ground-state and
                      1⁢𝑠⁢2⁢𝑠3𝑆 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
                      1⁢𝑠21𝑆→2⁢ℓ⁢𝑛⁢ℓ′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
                      1⁢𝑠⁢2⁢𝑠3𝑆→2⁢ℓ⁢𝑛⁢ℓ′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.},
      cin          = {DOOR ; HAS-User / FS-PETRA-S},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-PETRA-S-20210408},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      FS-Proposal: I-20220764 (I-20220764) / DFG project
                      G:(GEPRIS)509471550 - Dynamik photoionisations-induzierter
                      Prozesse in laser-präparierten Molekülen in der Gasphase
                      und der wässrigen Phase (509471550)},
      pid          = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20220764 / G:(GEPRIS)509471550},
      experiment   = {EXP:(DE-H253)P-P04-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001379140600005},
      doi          = {10.1103/PhysRevA.110.062802},
      url          = {https://bib-pubdb1.desy.de/record/618893},
}