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Equilibration dynamics and conductivity of warm dense hydrogen.

Zastrau, U, Sperling, P, Becker, A, Bornath, T, Bredow, R, Döppner, T, Dziarzhytski, S, Fennel, T, Fletcher, LB, Förster, E , Fortmann, C, Glenzer, SH, Göde, S, Gregori, G, Harmand, M, Hilbert, V, Holst, B, Laarmann, T, Lee, HJ, Ma, T, Mithen, JP, Mitzner, R, Murphy, CD, Nakatsutsumi, M, Neumayer, P, Przystawik, A, Roling, S, Schulz, M, Siemer, B, Skruszewicz, S, Tiggesbäumker, J, Toleikis, S, Tschentscher, T, White, T, Wöstmann, M, Zacharias, H and Redmer, R (2014) Equilibration dynamics and conductivity of warm dense hydrogen. Phys Rev E Stat Nonlin Soft Matter Phys, 90 (1).

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Abstract

We investigate subpicosecond dynamics of warm dense hydrogen at the XUV free-electron laser facility (FLASH) at DESY (Hamburg). Ultrafast impulsive electron heating is initiated by a ≤ 300-fs short x-ray burst of 92-eV photon energy. A second pulse probes the sample via x-ray scattering at jitter-free variable time delay. We show that the initial molecular structure dissociates within (0.9 ± 0.2) ps, allowing us to infer the energy transfer rate between electrons and ions. We evaluate Saha and Thomas-Fermi ionization models in radiation hydrodynamics simulations, predicting plasma parameters that are subsequently used to calculate the static structure factor. A conductivity model for partially ionized plasma is validated by two-temperature density-functional theory coupled to molecular dynamic simulations and agrees with the experimental data. Our results provide important insights and the needed experimental data on transport properties of dense plasmas.

Item Type: Article
Authors :
NameEmailORCID
Zastrau, U
Sperling, P
Becker, A
Bornath, T
Bredow, R
Döppner, T
Dziarzhytski, S
Fennel, T
Fletcher, LB
Förster, E
Fortmann, C
Glenzer, SH
Göde, S
Gregori, G
Harmand, M
Hilbert, V
Holst, B
Laarmann, T
Lee, HJ
Ma, T
Mithen, JPj.mithen@surrey.ac.uk
Mitzner, R
Murphy, CD
Nakatsutsumi, M
Neumayer, P
Przystawik, A
Roling, S
Schulz, M
Siemer, B
Skruszewicz, S
Tiggesbäumker, J
Toleikis, S
Tschentscher, T
White, T
Wöstmann, M
Zacharias, H
Redmer, R
Date : July 2014
Identification Number : 10.1103/PhysRevE.90.013104
Uncontrolled Keywords : Electric Conductivity, Electrons, Hydrodynamics, Hydrogen, Lasers, Molecular Dynamics Simulation, Quantum Theory, Temperature, X-Ray Diffraction
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:22
Last Modified : 17 May 2017 13:22
URI: http://epubs.surrey.ac.uk/id/eprint/838956

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