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Title: Observation of inhibited electron-ion coupling in strongly heated graphite

Journal Article · · Scientific Reports
DOI: https://doi.org/10.1038/srep00889 · OSTI ID:1624579
 [1];  [2];  [3];  [3];  [4];  [4];  [5];  [6];  [4];  [4];  [7];  [8];  [5];  [5];  [2];  [7]
  1. Univ. of Oxford (United Kingdom). Clarendon Lab.; DOE/OSTI
  2. Univ. of Warwick, Coventry (United Kingdom). Dept. of Physics. Centre for Fusion, Space and Astrophysics
  3. Univ. of Oxford (United Kingdom). Clarendon Lab.; AWE, Aldermaston, Reading, Berkshire (United Kingdom)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. AWE, Aldermaston, Reading, Berkshire (United Kingdom)
  6. GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany). Extreme Matter Inst.
  7. Univ. of Oxford (United Kingdom). Clarendon Lab.
  8. GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany). Extreme Matter Inst.

Creating non-equilibrium states of matter with highly unequal electron and lattice temperatures (Tele≠Tion) allows unsurpassed insight into the dynamic coupling between electrons and ions through time-resolved energy relaxation measurements. Recent studies on low-temperature laser-heated graphite suggest a complex energy exchange when compared to other materials. To avoid problems related to surface preparation, crystal quality and poor understanding of the energy deposition and transport mechanisms, we apply a different energy deposition mechanism, via laser-accelerated protons, to isochorically and non-radiatively heat macroscopic graphite samples up to temperatures close to the melting threshold. Using time-resolved x ray diffraction, we show clear evidence of a very small electron-ion energy transfer, yielding approximately three times longer relaxation times than previously reported. This is indicative of the existence of an energy transfer bottleneck in non-equilibrium warm dense matter.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1624579
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 2; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Ab initio model of optical properties of two-temperature warm dense matter text January 2018