Electron-ion temperature relaxation in warm dense hydrogen observed with picosecond resolved X-ray scattering

Electron-ion temperature relaxation in warm dense hydrogen observed with picosecond resolved X-ray scattering

Fletcher, L. B.; Vorberger, J.; Schumaker, W.; Ruyer, C.; Goede, S.; Galtier, E.; Zastrau, U.; Alves, E. P.; Baalrud, S. D.; Baggott, R. A.; Barbrel, B.; Chen, Z.; Döppner, T.; Gauthier, M.; Granados, E.; Kim, J. B.; Kraus, D.; Lee, H. J.; Macdonald, M. J.; Mishra, R.; Pelka, A.; Ravasio, A.; Roedel, C.; Fry, A. R.; Redmer, R.; Fiuza, F.; Gericke, D. O.; Glenzer, S. H.

Angularly resolved X-ray scattering measurements from fs-laser heated hydrogen have been
used to determine the equilibration of electron and ion temperatures in the warm dense matter
regime. The relaxation of rapidly heated cryogenic hydrogen is visualized using 5.5 keV X-ray
pulses from the Linac Coherent Light (LCLS) source in a 1 Hz repetition rate pump-probe setting.
We demonstrate that the electron-ion energy transfer is faster than quasi-classical Landau-Spitzer
models that use ad hoc cutoffs in the Coulomb logarithm.

Keywords: warm dense matter; x-ray scattering; relaxation; femtosecond; hydrogen jet

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