Observation of inhibited electron-ion coupling in strongly heated graphite
- Univ. of Oxford (United Kingdom). Clarendon Lab.; DOE/OSTI
- Univ. of Warwick, Coventry (United Kingdom). Dept. of Physics. Centre for Fusion, Space and Astrophysics
- Univ. of Oxford (United Kingdom). Clarendon Lab.; AWE, Aldermaston, Reading, Berkshire (United Kingdom)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- AWE, Aldermaston, Reading, Berkshire (United Kingdom)
- GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany). Extreme Matter Inst.
- Univ. of Oxford (United Kingdom). Clarendon Lab.
- 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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