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

Journal Article · Fri May 15 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4920943· OSTI ID:22410403

Kraus, D.; Barbrel, B.; Falcone, R. W. ^[1]; Vorberger, J. ^[2]; Helfrich, J.; Frydrych, S.; Ortner, A.; Otten, A.; Roth, F.; Schaumann, G.; Schumacher, D.; Siegenthaler, K.; Wagner, F.; Roth, M. ^[3]; Gericke, D. O.; Wünsch, K. ^[4]; Bachmann, B.; Döppner, T. ^[5]; Bagnoud, V.; Blažević, A. ^[6] ; others, and

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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)

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.

• OSTI ID: 22410403
• Journal Information: Physics of Plasmas, Vol. 22, Issue 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

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