Record Details

Title:
Equilibration dynamics and conductivity of warm dense hydrogen
Affiliation(s):
EuXFEL staff, Other
Author group:
Instrument SPB/SFX
Management Board
Instrument HED
Topic:
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-rayburst of 92-eV photon energy. A second pulse probes the sample via x-ray scattering at jitter-free variabletime delay. We show that the initial molecular structure dissociates within (0.9 ± 0.2) ps, allowing us to inferthe energy transfer rate between electrons and ions. We evaluate Saha and Thomas-Fermi ionization modelsin radiation hydrodynamics simulations, predicting plasma parameters that are subsequently used to calculatethe static structure factor. A conductivity model for partially ionized plasma is validated by two-temperaturedensity-functional theory coupled to molecular dynamic simulations and agrees with the experimental data. Ourresults provide important insights and the needed experimental data on transport properties of dense plasmas.
Imprint:
College Park, Md., APS, 2014
Journal Information:
Phys. Rev. E (2014)
Related external records:
DOI: 10.1103/PhysRevE.90.013104
WOS: WOS:000339565200009


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 Record created 2016-10-11, last modified 2019-02-08

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