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Observation of inhibited electron-ion coupling in strongly heated graphite
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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
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WRAP_Vorberger_srep00889.pdf - Published Version Available under License Creative Commons Attribution Non-commercial Share Alike. Download (1499Kb) | Preview |
Official URL: http://dx.doi.org/10.1038/srep00889
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 > 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: |
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| 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 | ||||
| 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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