Electron-ion equilibration in ultrafast heated graphite
T G White1, N J Hartley1, B Borm2
1Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
Abstract:
We have employed fast electrons produced by intense laser illumination to isochorically heat thermal electrons in solid density carbon to temperatures of ∼10,000 K. Using time-resolved x-ray diffraction, the temperature evolution of the lattice ions is obtained through the Debye-Waller effect, and this directly relates to the electron-ion equilibration rate. This is shown to be considerably lower than predicted from ideal plasma models. We attribute this to strong ion coupling screening the electron-ion interaction.
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