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Title: The complex ion structure of warm dense carbon measured by spectrally resolved x-ray scattering

We present measurements of the complex ion structure of warm dense carbon close to the melting line at pressures around 100 GPa. High-pressure samples were created by laser-driven shock compression of graphite and probed by intense laser-generated x-ray sources with photon energies of 4.75 keV and 4.95 keV. High-efficiency crystal spectrometers allow for spectrally resolving the scattered radiation. Comparing the ratio of elastically and inelastically scattered radiation, we find evidence for a complex bonded liquid that is predicted by ab-initio quantum simulations showing the influence of chemical bonds under these conditions. Using graphite samples of different initial densities we demonstrate the capability of spectrally resolved x-ray scattering to monitor the carbon solid-liquid transition at relatively constant pressure of 150 GPa. Showing first single-pulse scattering spectra from cold graphite of unprecedented quality recorded at the Linac Coherent Light Source, we demonstrate the outstanding possibilities for future high-precision measurements at 4th Generation Light Sources.
Authors:
; ;  [1] ;  [2] ; ; ; ; ; ; ; ; ; ;  [3] ; ;  [4] ; ;  [5] ; ;  [6] more »; « less
  1. Department of Physics, University of California, Berkeley, California 94720 (United States)
  2. Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden (Germany)
  3. Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt (Germany)
  4. Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)
  5. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
  6. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt (Germany)
Publication Date:
OSTI Identifier:
22410403
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCURACY; CHEMICAL BONDS; COMPRESSION; CRYSTAL-PHASE TRANSFORMATIONS; CRYSTALS; GRAPHITE; IONS; KEV RANGE; LASERS; LIGHT SOURCES; LINEAR ACCELERATORS; MELTING; PHOTONS; PRESSURE RANGE GIGA PA; PRESSURE RANGE MEGA PA 10-100; QUANTUM MECHANICS; SPECTROMETERS; X-RAY DIFFRACTION; X-RAY SOURCES