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@ARTICLE{Vinko:441818,
      author       = {Vinko, Sam and Vozda, Vojtech and Andreasson, Jakob and
                      Bajt, S. and Bielecki, Johan and Burian, Tomas and
                      Chalupsky, Jaromir and Ciricosta, Orlando and Desjarlais, M.
                      P. and Fleckenstein, H. and Hajdu, Janos and Hajkova, Vera
                      and Hollebon, Patrick and Juha, Libor and Kasim, M. F. and
                      McBride, E. E. and Muehlig, Kerstin and Preston, T. R. and
                      Rackstraw, D. S. and Roling, Sebastian and Toleikis, S. and
                      Wark, Justin and Zacharias, Helmut},
      title        = {{T}ime-{R}esolved {XUV} {O}pacity {M}easurements of {W}arm
                      {D}ense {A}luminum},
      journal      = {Physical review letters},
      volume       = {124},
      number       = {22},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PUBDB-2020-02737},
      pages        = {225002},
      year         = {2020},
      abstract     = {The free-free opacity in plasmas is fundamental to our
                      understanding of energy transport in stellar interiors and
                      for inertial confinement fusion research. However,
                      theoretical predictions in the challenging dense plasma
                      regime are conflicting and there is a dearth of accurate
                      experimental data to allow for direct model validation. Here
                      we present time-resolved transmission measurements in
                      solid-density Al heated by an XUV free-electron laser. We
                      use a novel functional optimization approach to extract the
                      temperature-dependent absorption coefficient directly from
                      an oversampled pool of single-shot measurements, and find a
                      pronounced enhancement of the opacity as the plasma is
                      heated to temperatures of order of the Fermi energy. Plasma
                      heating and opacity enhancement are observed on ultrafast
                      timescales, within the duration of the femtosecond XUV
                      pulse. We attribute further rises in the opacity on ps
                      timescales to melt and the formation of warm dense matter.},
      cin          = {DOOR ; HAS-User / FS-FLASH-O / FS-ML / FS-CFEL-1},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-FLASH-O-20160930 / I:(DE-H253)FS-ML-20120731 /
                      I:(DE-H253)FS-CFEL-1-20120731},
      pnm          = {6211 - Extreme States of Matter: From Cold Ions to Hot
                      Plasmas (POF3-621) / 6G2 - FLASH (POF3-622) /
                      $StUpPD_149_14$ - Selective C-C bond cleavage in alkoxides,
                      applicable in lignin valorization $(ZUK2-SU-StUpPD_149_14)$
                      / CALIPSO - Coordinated Access to Lightsources to Promote
                      Standards and Optimization (312284)},
      pid          = {G:(DE-HGF)POF3-6211 / G:(DE-HGF)POF3-6G2 /
                      $G:(DE-82)ZUK2-SU-StUpPD_149_14$ / G:(EU-Grant)312284},
      experiment   = {EXP:(DE-H253)F-BL2-20150101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:32567902},
      UT           = {WOS:000537620500007},
      doi          = {10.1103/PhysRevLett.124.225002},
      url          = {https://bib-pubdb1.desy.de/record/441818},
}