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@ARTICLE{Mueller:623884,
      author       = {Mueller, Alfred and Hillenbrand, Pierre-Michel and Wang,
                      Shuxing and Schippers, Stefan and Bray, I. and Kheifets, A.
                      S. and Lindroth, Eva and Reinwardt, Simon and Martins,
                      Michael and Seltmann, J. and Trinter, F.},
      title        = {{D}irect double ionization of the {H}e-like ${B}^{3+}$ ion
                      by a single photon},
      journal      = {Physical review / A},
      volume       = {111},
      number       = {2},
      issn         = {2469-9926},
      reportid     = {PUBDB-2025-00804},
      pages        = {023115},
      year         = {2025},
      abstract     = {Within a joint experimental and theoretical research
                      project, double photoionization of the He-like B$^{3+}$ ion
                      by a single photon was studied in the energy range from
                      approximately 350 to 1160 eV. With the parent-ion beam in
                      the experiment containing both $1⁢𝑠^2⁢\;^1⁢𝑆$
                      ground-state (90.9\%) and $1⁢𝑠⁢2⁢𝑠\;^3𝑆$
                      metastable B$^{3+}$ ions (9.1\%), two contributions to the
                      apparent single- and double-ionization cross sections,
                      $\sigma^\mathrm{app}_{34}$ and $\sigma^\mathrm{app}_{35}$,
                      respectively, are involved in the measurements. Ratios
                      𝑌⁡(5+)/𝑌⁡(4+) of double- over single-ionization
                      yields were experimentally determined. By multiplying the
                      measured ratios by the known cross section
                      $\sigma^\mathrm{app}_{34}$, the apparent cross section
                      $\sigma^\mathrm{app}_{35}$ for double ionization was
                      inferred. Using the information thus obtained, the measured
                      yield of B$^{5+}$ ions produced from hydrogenlike B$^{4+}$
                      could also be normalized. The results show good agreement
                      with theoretical benchmark cross sections $\sigma_{45}$ for
                      single photoionization of B$^{4+}$. Convergent
                      close-coupling calculations were performed to determine
                      double-photoionization cross sections $\sigma_{35}$ for
                      B$^{3+}$⁡($1s^2$) and B$^{3+}$⁡($1s2s$) ions. The result
                      for the ground state agrees very well with theoretical data
                      obtained previously with an intermediate-energy $R$-matrix
                      approach. Within the systematic uncertainty of the
                      normalized experimental cross sections, calculated and
                      measured data are in agreement with one another.},
      cin          = {FS DOOR-User / FS-PET-S},
      ddc          = {530},
      cid          = {$I:(DE-H253)FS_DOOR-User-20241023$ /
                      I:(DE-H253)FS-PET-S-20190712},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / 6G3 - PETRA III (DESY) (POF4-6G3) / 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) / FS-Proposal: I-20220764 (I-20220764)},
      pid          = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G3 /
                      G:(GEPRIS)509471550 / G:(GEPRIS)510114039 /
                      G:(DE-H253)I-20220764},
      experiment   = {EXP:(DE-H253)P-P04-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001447702400012},
      doi          = {10.1103/PhysRevA.111.023115},
      url          = {https://bib-pubdb1.desy.de/record/623884},
}