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@ARTICLE{Hoeppe:617635,
      author       = {Hoeppe, Hannes P and Osterhoff, Markus and Aghel Maleki,
                      Atiyeh and Rosselló, Juan M and Vassholz, Malte and
                      Hagemann, Johannes and Engler, Thea and Schwarz, Daniel and
                      Rodriguez-Fernandez, Angel and Boesenberg, Ulrike and
                      Möller, Johannes and Shayduk, Roman and Hallmann, Jörg and
                      Madsen, Anders and Mettin, Robert and Salditt, Tim},
      title        = {{T}he collapse of a sonoluminescent cavitation bubble
                      imaged with {X}-ray free-electron laser pulses},
      journal      = {New journal of physics},
      volume       = {26},
      number       = {3},
      issn         = {1367-2630},
      address      = {[London]},
      publisher    = {IOP},
      reportid     = {PUBDB-2024-06941},
      pages        = {033002},
      year         = {2024},
      note         = {DFG grant Me 1645/5-2.},
      abstract     = {Single bubble sonoluminescence (SBSL) is the phenomenon of
                      synchronous light emission due to the violent collapse of a
                      single spherical bubble in a liquid, driven by an ultrasonic
                      field. During the bubble collapse, matter inside the bubble
                      reaches extreme conditions of several gigapascals and
                      temperatures on the order of 10000 K, leading to
                      picosecond flashes of visible light. To this day, details
                      regarding the energy focusing mechanism rely on simulations
                      due to the fast dynamics of the bubble collapse and spatial
                      scales below the optical resolution limit. In this work we
                      present phase-contrast holographic imaging with single x-ray
                      free-electron laser (XFEL) pulses of a SBSL cavitation
                      bubble in water. X-rays probe the electron density structure
                      and by that provide a uniquely new view on the bubble
                      interior and its collapse dynamics. The involved fast
                      time-scales are accessed by sub-100 fs XFEL pulses and a
                      custom synchronization scheme for the bubble oscillator. We
                      find that during the whole oscillation cycle the bubble's
                      density profile can be well described by a simple step-like
                      structure, with the radius R following the dynamics of the
                      Gilmore model. The quantitatively measured internal density
                      and width of the boundary layer exhibit a large variance.
                      Smallest reconstructed bubble sizes reach down to R ≃ 0.8
                      μm, and are consistent with spherical symmetry. While we
                      here achieved a spatial resolution of a few 100 nm, the
                      visibility of the bubble and its internal structure is
                      limited by the total x-ray phase shift which can be scaled
                      with experimental parameters.},
      cin          = {FS-PETRA / $XFEL_E1_MID$},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-PETRA-20140814 /
                      $I:(DE-H253)XFEL_E1_MID-20210408$},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / HIDSS-0002 - DASHH: Data Science in Hamburg -
                      Helmholtz Graduate School for the Structure of Matter
                      $(2019_IVF-HIDSS-0002)$},
      pid          = {G:(DE-HGF)POF4-631 / $G:(DE-HGF)2019_IVF-HIDSS-0002$},
      experiment   = {EXP:(DE-H253)XFEL-SASE2-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001176689700001},
      doi          = {10.1088/1367-2630/ad295b},
      url          = {https://bib-pubdb1.desy.de/record/617635},
}