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@ARTICLE{Mller:627839,
      author       = {Müller, A. and Hillenbrand, Pierre-Michel and Wang, S.-X.
                      and Schippers, S. and Reinwardt, Simon and Martins, M. and
                      Seltmann, Joern and Trinter, Florian and Bray, I. and Fursa,
                      D. V. and Kheifets, A. S.},
      title        = {{S}ingle and double photoionization of the {L}i-like
                      {B}$^{2+}$ ion: {S}trong ionization-excitation
                      contributions},
      journal      = {Physical review / A},
      volume       = {111},
      number       = {5},
      issn         = {2469-9926},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {PUBDB-2025-01622},
      pages        = {053108},
      year         = {2025},
      abstract     = {Single and double photoionization of the Li-like B$^{2+}$
                      (1s$^2$2s$^2$S) ion were studied both experimentally and
                      theoretically in the energy range from approximately
                      250–1200 eV. The cross section $σ_{23}$ for net single
                      ionization in that range is dominated by direct removal of
                      one K-shell electron, a process that is described very well
                      by theory. Accordingly, measured yields of B$^{3+}$
                      photoproducts were normalized to theory to obtain absolute
                      cross sections $σ_{23}$. Aside from direct single
                      ionization, there are additional contributions to $σ_{23}$
                      from photoabsorption resonances. The parameters of the Fano
                      profile of the most prominent of these resonances, the
                      triply excited 2$^2$2p$^2$SP state, were calculated by
                      employing the convergent close coupling (CCC) approach and
                      the theoretical results were experimentally verified. Using
                      the normalization procedure obtained from the investigation
                      of single ionization, also the measured yields of B$^{4+}$
                      product ions could be put on an absolute cross-section
                      scale. The resulting experimental cross section $σ_{24}$ is
                      in good accord with the CCC calculations revealing
                      unexpectedly strong contributions that arise from ionization
                      with excitation of B$^{2+}$ (1s$^2$2s$^2$S) forming
                      intermediate autoionizing B$^{3+}$ (nln'l') levels, which
                      subsequently decay to B$^{4+}$ by Auger-electron emission.
                      In addition, contributions to $σ_{24}$ from resonant
                      excitation of B$^{2+}$ (nln'l'n''l'') with n, n', n'' >= 2
                      could be identified. These triply excited resonances with
                      an empty K shell can decay by simultaneous or sequential
                      emission of two electrons and thus contribute to net double
                      photoionization of the parent B$^{2+}$ ion.},
      cin          = {DOOR ; HAS-User / FS-PETRA-S},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-PETRA-S-20210408},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 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) / DFG project
                      G:(GEPRIS)510114039 - Dissoziationsdynamik von
                      rumpfniveauangeregten ionischen, molekularen Radikalen
                      (510114039)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20220764 / G:(GEPRIS)509471550 /
                      G:(GEPRIS)510114039},
      experiment   = {EXP:(DE-H253)P-P04-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001492153800006},
      doi          = {10.1103/PhysRevA.111.053108},
      url          = {https://bib-pubdb1.desy.de/record/627839},
}