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Abstract
Focusing XFEL pulses on thin Cu films results in the creation of warm dense matter with electron temperatures exceeding 100 eV. The transmitted spectrum at the Cu-L3 edge exhibits a strong intensity dependent response from increased opacity to transparency. Our theoretical framework that integrates a kinetic plasma model and a finite-temperature, short-range scattering DFT approach attributes the spectral changes to opening and closing of 2p-3d transitions in the generated ions, which also affects elastic x-ray scattering: In a recent experiment we have observed a 12-fold increase of the elastic x-ray diffraction peak at the Cu L3 edge of a B4C-Cu-SiC multilayer.
Bio
Nina Rohringer is lead scientist at DESY and professor at the University of Hamburg. She studies fundamental processes of the nonlinear interaction of ultrafast pulses of X-ray free-electron lasers with matter. After her doctoral degree from Vienna University of Technology in theoretical atomic and optical physics, she ventured in the field of ultrafast x-ray science and held postdoctoral positions at Argonne National Laboratory and Lawrence Livermore National Laboratory, before becoming a group leader within the Max Planck Institute for the Physics of Complex Systems and the Centre for Free-Electron Laser Studies in Hamburg.
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