Observation of inhibited electron-ion coupling in strongly heated graphite.
Observation of inhibited electron-ion coupling in strongly heated graphite.
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DOI:
10.1038/srep00889
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发表时间:
2012
影响因子:
4.6
通讯作者:
Gregori G
中科院分区:
文献类型:
--
作者:
White TG;Vorberger J;Brown CR;Crowley BJ;Davis P;Glenzer SH;Harris JW;Hochhaus DC;Le Pape S;Ma T;Murphy CD;Neumayer P;Pattison LK;Richardson S;Gericke DO;Gregori G
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.
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影响因子:
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通讯作者:
McKenna, P.
影响因子:
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FORSMAN, A
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Hastings, JB
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Gericke, D. O.
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