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@ARTICLE{Khn:430143,
      author       = {Kühn, Steffen and Shah, Chintan and López-Urrutia, José
                      R. Crespo and Fujii, Keisuke and Steinbrügge, René and
                      Stierhof, Jakob and Togawa, Moto and Harman, Zoltán and
                      Oreshkina, Natalia S. and Cheung, Charles and Kozlov,
                      Mikhail G. and Porsev, Sergey G. and Safronova, Marianna S.
                      and Berengut, Julian C. and Rosner, Michael and Bissinger,
                      Matthias and Ballhausen, Ralf and Hell, Natalie and Park,
                      SungNam and Chung, Moses and Hoesch, Moritz and Seltmann,
                      Jörn and Surzhykov, Andrey S. and Yerokhin, Vladimir A. and
                      Wilms, Jörn and Porter, F. Scott and Stöhlker, Thomas and
                      Keitel, Christoph H. and Pfeifer, Thomas and Brown, Gregory
                      V. and Leutenegger, Maurice A. and Bernitt, Sven},
      title        = {{H}igh-resolution {P}hoto-excitation {M}easurements
                      {E}xacerbate the {L}ong-standing {F}e {XVII} {E}mission
                      {P}roblem},
      reportid     = {PUBDB-2019-05599, arXiv:1911.09707},
      year         = {2019},
      note         = {Main text (6 pages, 3 figures), Supplmentary Material (7
                      pages, 3 figures), submitted to PRL},
      abstract     = {We measured the L-shell soft X-ray fluorescence of Fe XVII
                      ions in an electron beam ion trap following resonant
                      photo-excitation using synchrotron radiation provided by the
                      P04 beamline at PETRA III. Special attention is paid to two
                      2p-3d transitions, the 3C and 3D lines that are essential
                      plasma diagnostics tools for astrophysics. Their resulting
                      oscillator-strength ratio, f(3C)/f(3D) = 3.09(8)(6), is
                      three times more accurate than previous results. The present
                      ratio clearly departs by approximately 5-sigmas from the
                      newest ab initio calculations but confirms previous
                      laboratory measurements and astrophysical observations. A
                      ten thousand-fold reduction in excitation-photon intensity
                      and ten times higher spectral resolution allow us to exclude
                      current explanations, reinstating a forty-year-old
                      atomic-physics puzzle.},
      cin          = {DOOR ; HAS-User / FS-PET-S},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-PET-S-20190712},
      pnm          = {6G3 - PETRA III (POF3-622) / FS-Proposal: I-20180534
                      (I-20180534)},
      pid          = {G:(DE-HGF)POF3-6G3 / G:(DE-H253)I-20180534},
      experiment   = {EXP:(DE-H253)P-P04-20150101},
      typ          = {PUB:(DE-HGF)25 / PUB:(DE-HGF)29},
      eprint       = {1911.09707},
      howpublished = {arXiv:1911.09707},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1911.09707;\%\%$},
      doi          = {10.3204/PUBDB-2019-05599},
      url          = {https://bib-pubdb1.desy.de/record/430143},
}