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Sci Rep. 2012;2:889. doi: 10.1038/srep00889. Epub 2012 Nov 27.

Observation of inhibited electron-ion coupling in strongly heated graphite.

Author information

  • 1University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, UK. thomas.white@physics.ox.ac.uk

Abstract

Creating non-equilibrium states of matter with highly unequal electron and lattice temperatures (T(ele)≠T(ion)) 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.

PMID:
23189238
[PubMed]
PMCID:
PMC3506979
Free PMC Article

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