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

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4920943· OSTI ID:1466943
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  1. Univ. of California, Berkeley, CA (United States). Dept. of Physics
  2. Max-Planck-Inst. fur Physik komplexer Systeme, Dresden (Germany)
  3. Technische Univ. Darmstadt (Germany). Inst. fur Kernphysik
  4. Univ. of Warwick, Coventry (United Kingdom). Centre for Fusion, Space and Astrophysics, Dept. of Physics
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  7. Univ. of California, Berkeley, CA (United States). Dept. of Physics
  8. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL), Central Laser Facility
  9. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  10. Helmholtz-Inst. Jena, Jena (Germany)
  11. Univ. of Oxford (United Kingdom). Dept. of Physics
  12. Queen’s Univ., Belfast (United States). Centre for Plasma Physics

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. Finally, 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.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1466943
Report Number(s):
LLNL-JRNL-755891; PHPAEN; 942428
Journal Information:
Physics of Plasmas, Vol. 22, Issue 5; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (6)

Nanosecond formation of diamond and lonsdaleite by shock compression of graphite journal March 2016
High-pressure chemistry of hydrocarbons relevant to planetary interiors and inertial confinement fusion journal May 2018
Multi-keV X-ray area source intensity at SGII laser facility journal May 2018
Measurement of ionic structure in isochorically heated graphite from X-ray Thomson scattering journal February 2019
Characterizing the ionization potential depression in dense carbon plasmas with high-precision spectrally resolved x-ray scattering journal November 2018
X-ray scattering measurements on imploding CH spheres at the National Ignition Facility journal July 2016