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Ultrafast short-range disordering of femtosecond-laser-heated warm dense aluminum

Abstract : We have probed, with time-resolved x-ray absorption near-edge spectroscopy (XANES), a femtosecond-laser-heated aluminum foil with fluences up to 1 J/cm2. The spectra reveal a loss of the short-range order in a few picoseconds. This time scale is compared with the electron-ion equilibration time, calculated with a two-temperature model. Hydrodynamic simulations shed light on complex features that affect the foil dynamics, including progressive density change from solid to liquid (∼10 ps). In this density range, quantum molecular dynamics simulations indicate that XANES is a relevant probe of the ionic temperature.
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Contributor : Fabien Dorchies Connect in order to contact the contributor
Submitted on : Thursday, July 13, 2017 - 1:26:56 PM
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P. M. Leguay, A. Levy, B. Chimier, F. Deneuville, D. Descamps, et al.. Ultrafast short-range disordering of femtosecond-laser-heated warm dense aluminum. Physical Review Letters, American Physical Society, 2013, 111 (24), ⟨10.1103/PhysRevLett.111.245004⟩. ⟨hal-01561843⟩



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