Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 14: Posters 3: Novelties in Molecular Physics: Theory of Molecular Dynamics, Collisions and Energy Transfer, and Experimental Techniques
MO 14.4: Poster
Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof
Ab initio calculations of the Ion feature in X-ray Thomson scattering — Kai-Uwe Plagemann1, Hannes Rüter1, Thomas Bornath1, •Mohammed Shihab1,2, Michael P. Desjarlais3, Carsten Fortmann4, Siegfried H. Glenzer5, and Ronald Redmer1 — 1Institut für Physik, Universität Rostock, Germany — 2Physics Department, Tanta University, Egypt — 3SNL, Albuquerque, USA — 4QuantumWise A/S, 2100 Copenhagen, Denmark — 5SLAC, Menlo Park, C 94025, USA
Warm dense matter of solid-like densities and temperatures of several eV is relevant for planetary interiors and inertial confinement fusion experiments. A versatile and reliable tool to probe such extreme states of matter is X-ray Thomson scattering (XRTS) from which information about plasma parameters can be inferred directly from the dynamic structure factor [1]. An important contribution to the dynamic structure factor is the ion feature [2] which describes elastic scattering of X-rays off electrons. We apply an ab initio method for the calculation of the form factor of bound electrons, the slope of the screening cloud of free electrons, and the ion-ion structure factor in warm dense beryllium. With the presented method we can calculate the ion feature from first principles [3]. These results will facilitate a better understanding of X-ray scattering in warm dense matter and an accurate measurement of ion temperatures which would allow determining non-equilibrium conditions, e.g., along shock propagation. [1] Glenzer and Redmer, Rev. Mod. Phys., 81(2009).[2] Chihara, J. Phys.: Condens. Matter, 12(2000).[3] K.-U. Plagemann et al., Phys. Rev. E 92(2015).