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@ARTICLE{Aufleger:476364,
      author       = {Aufleger, Lennart and Friebel, Patrick and Rupprecht,
                      Patrick and Magunia, Alexander and Ding, Thomas and Rebholz,
                      Marc and Hartmann, Maximilian and Ott, Christian and
                      Pfeifer, Thomas},
      title        = {{L}ine-shape broadening of an autoionizing state in helium
                      at high {XUV} intensity},
      journal      = {New journal of physics},
      volume       = {24},
      number       = {1},
      issn         = {1367-2630},
      address      = {[London]},
      publisher    = {IOP},
      reportid     = {PUBDB-2022-01703},
      pages        = {013014 -},
      year         = {2022},
      abstract     = {We study the interaction of intense extreme ultraviolet
                      (XUV) light with the 2s2p doubly excitedstate in helium. In
                      addition to previously understood energy-level and phase
                      shifts, high XUVintensities may lead to other
                      absorption-line-shape distortions. Here, we report on
                      experimentaltransient-absorption spectroscopy results on the
                      2s2p line-width modification in helium in intensestochastic
                      XUV fields. A few-level-model simulation is realized to
                      investigate the origins of thiseffect. We find that the
                      line-shape broadening is connected to the strong coupling of
                      the groundstate to the 2s2p doubly excited state which is
                      embedded in the ionization continuum. As thebroadening takes
                      place for intensities lower than for other strong-coupling
                      processes, e.g. observedasymmetry changes of the absorption
                      profile, this signature can be identified already in
                      anintermediate intensity regime. These findings are in
                      general relevant for resonant inner-shelltransitions in
                      nonlinear experiments with XUV and x-ray photon energies at
                      high intensity.},
      cin          = {DOOR ; HAS-User / H1/MPIH},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      $I:(DE-H253)H1_MPIH-20120731$},
      pnm          = {6G2 - FLASH (DESY) (POF4-6G2)},
      pid          = {G:(DE-HGF)POF4-6G2},
      experiment   = {EXP:(DE-H253)F-BL2-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000749506300001},
      doi          = {10.1088/1367-2630/ac3b2e},
      url          = {https://bib-pubdb1.desy.de/record/476364},
}