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@ARTICLE{Ding:459956,
      author       = {Ding, Thomas and Rebholz, Marc and Aufleger, Lennart and
                      Hartmann, Maximilian and Stooß, Veit and Magunia, Alexander
                      and Birk, Paul and Borisova, Gergana Dimitrova and da Costa
                      Castanheira, Carina and Rupprecht, Patrick and Mi, Yonghao
                      and Gaumnitz, Thomas and Loh, Zhi-Heng and Roling, Sebastian
                      and Butz, Marco and Zacharias, Helmut and Düsterer, Stefan
                      and Treusch, Rolf and Ott, Christian and Pfeifer, Thomas},
      title        = {{XUV} pump–{XUV} probe transient absorption spectroscopy
                      at {FEL}s},
      journal      = {Faraday discussions},
      volume       = {228},
      issn         = {1364-5498},
      address      = {Cambridge [u.a.]},
      publisher    = {Soc.},
      reportid     = {PUBDB-2021-02839},
      pages        = {519 - 536},
      year         = {2021},
      abstract     = {The emergence of ultra-intense extreme-ultraviolet (XUV)
                      and X-ray free-electron lasers (FELs) has opened the door
                      for the experimental realization of non-linear XUV and X-ray
                      spectroscopy techniques. Here we demonstrate an experimental
                      setup for an all-XUV transient absorption spectroscopy
                      method for gas-phase targets at the FEL. The setup combines
                      a high spectral resolving power of $E/ΔE$ ≈ 1500 with
                      sub-femtosecond interferometric resolution, and covers a
                      broad XUV photon-energy range between approximately 20 and
                      110 eV. We demonstrate the feasibility of this setup firstly
                      on a neon target. Here, we intensity- and time-resolve key
                      aspects of non-linear XUV-FEL light–matter interactions,
                      namely the non-resonant ionization dynamics and resonant
                      coupling dynamics of bound states, including XUV-induced
                      Stark shifts of energy levels. Secondly, we show that this
                      setup is capable of tracking the XUV-initiated dissociation
                      dynamics of small molecular targets (oxygen and
                      diiodomethane) with site-specific resolution, by measuring
                      the XUV transient absorption spectrum. In general,
                      benefitting from a single-shot detection capability, we show
                      that the setup and method provides single-shot phase-locked
                      XUV pulse pairs. This lays the foundation to perform, in the
                      future, experiments as a function of the XUV interferometric
                      time delay and the relative phase, which enables advanced
                      coherent non-linear spectroscopy schemes in the XUV and
                      X-ray spectral range.},
      cin          = {DOOR ; HAS-User / FS-FLASH-O / FS-FLASH-D},
      ddc          = {540},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-FLASH-O-20160930 /
                      I:(DE-H253)FS-FLASH-D-20160930},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / 6G2 - FLASH (DESY) (POF4-6G2)},
      pid          = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G2},
      experiment   = {EXP:(DE-H253)F-BL2-20150101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {33575691},
      UT           = {WOS:000664793300026},
      doi          = {10.1039/D0FD00107D},
      url          = {https://bib-pubdb1.desy.de/record/459956},
}