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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, UUNSPECIFIEDUNSPECIFIED
Sperling, PUNSPECIFIEDUNSPECIFIED
Becker, AUNSPECIFIEDUNSPECIFIED
Bornath, TUNSPECIFIEDUNSPECIFIED
Bredow, RUNSPECIFIEDUNSPECIFIED
Döppner, TUNSPECIFIEDUNSPECIFIED
Dziarzhytski, SUNSPECIFIEDUNSPECIFIED
Fennel, TUNSPECIFIEDUNSPECIFIED
Fletcher, LBUNSPECIFIEDUNSPECIFIED
Förster, EUNSPECIFIEDUNSPECIFIED
Fortmann, CUNSPECIFIEDUNSPECIFIED
Glenzer, SHUNSPECIFIEDUNSPECIFIED
Göde, SUNSPECIFIEDUNSPECIFIED
Gregori, GUNSPECIFIEDUNSPECIFIED
Harmand, MUNSPECIFIEDUNSPECIFIED
Hilbert, VUNSPECIFIEDUNSPECIFIED
Holst, BUNSPECIFIEDUNSPECIFIED
Laarmann, TUNSPECIFIEDUNSPECIFIED
Lee, HJUNSPECIFIEDUNSPECIFIED
Ma, TUNSPECIFIEDUNSPECIFIED
Mithen, JPj.mithen@surrey.ac.ukUNSPECIFIED
Mitzner, RUNSPECIFIEDUNSPECIFIED
Murphy, CDUNSPECIFIEDUNSPECIFIED
Nakatsutsumi, MUNSPECIFIEDUNSPECIFIED
Neumayer, PUNSPECIFIEDUNSPECIFIED
Przystawik, AUNSPECIFIEDUNSPECIFIED
Roling, SUNSPECIFIEDUNSPECIFIED
Schulz, MUNSPECIFIEDUNSPECIFIED
Siemer, BUNSPECIFIEDUNSPECIFIED
Skruszewicz, SUNSPECIFIEDUNSPECIFIED
Tiggesbäumker, JUNSPECIFIEDUNSPECIFIED
Toleikis, SUNSPECIFIEDUNSPECIFIED
Tschentscher, TUNSPECIFIEDUNSPECIFIED
White, TUNSPECIFIEDUNSPECIFIED
Wöstmann, MUNSPECIFIEDUNSPECIFIED
Zacharias, HUNSPECIFIEDUNSPECIFIED
Redmer, RUNSPECIFIEDUNSPECIFIED
Date : July 2014
Identification Number : https://doi.org/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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