White, Thomas G., Vorberger, Jan, Brown, C. R. D., Crowley, B. J. B., Davis, P., Glenzer, S. H., Harris, J. W. O., Hochhaus, D. C., Le Pape, S., Ma, Tammy, Murphy, C. D., Neumayer, P., Pattison, L. K., Richardson, S., Gericke, Dirk O. and Gregori, Gianluca (2012) Observation of inhibited electron-ion coupling in strongly heated graphite. Scientific Reports, Volume 2 (Number 889). Article no. 889. doi:10.1038/srep00889 ISSN 2045-2322.

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Abstract

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.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Solid state physics, Electron-ion collisions, Graphite -- Thermal properties
Journal or Publication Title:	Scientific Reports
Publisher:	Nature Publishing Group
ISSN:	2045-2322
Official Date:	2012
Dates:	Date Event 2012 Published
Volume:	Volume 2
Number:	Number 889
Page Range:	Article no. 889
DOI:	10.1038/srep00889
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	24 December 2015
Date of first compliant Open Access:	24 December 2015
Funder:	Engineering and Physical Sciences Research Council (EPSRC), Atomic Weapons Establishment (Great Britain) (AWE), GSI Helmholtz Centre for Heavy Ion Research, Brookhaven National Laboratory. Laboratory Directed Research and Development (LDRD), United States. Department of Energy
Grant number:	EP/G007187/1, EP/ D062837, and EP/I014888/1 (EPSRC); 11-ERI-050 (LDRD); DE-AC52-07NA27344 (DoE)

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