The complex ion structure of warm dense carbon measured by spectrally resolved x-ray scatteringa)
- Univ. of California, Berkeley, CA (United States). Dept. of Physics
- Max-Planck-Inst. fur Physik komplexer Systeme, Dresden (Germany)
- Technische Univ. Darmstadt (Germany). Inst. fur Kernphysik
- Univ. of Warwick, Coventry (United Kingdom). Centre for Fusion, Space and Astrophysics, Dept. of Physics
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
- Univ. of California, Berkeley, CA (United States). Dept. of Physics
- Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL), Central Laser Facility
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Helmholtz-Inst. Jena, Jena (Germany)
- Univ. of Oxford (United Kingdom). Dept. of Physics
- 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
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