Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 47: Attosecond physics
A 47.7: Vortrag
Donnerstag, 20. März 2014, 18:00–18:15, BEBEL E42
Ultrafast resonant X-Ray scattering from electron wave packets — •Daria Popova1,2 and Robin Santra1,2 — 1Center for Free-Electron Laser Science, DESY, Notkestrasse 85, D-22607 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, D-22761 Hamburg, Germany
X-ray free electron laser sources enable ultrafast structural studies of matter with angstrom space and (sub-)femtosecond time resolutions. This makes them a promising tool for imaging of electron wave packet dynamics, which usually takes place on time scales ranging attoseconds to femtoseconds. X-ray resonant scattering is an advantageous technique that is an element-specific probe for charge and spin spatial modulations. We concentrate our study on diffraction of resonant hard X-ray radiation from dynamical electron systems. We examine its basic properties by providing several examples of scattering patterns calculated from different types of electronic wave packets. It has been discussed in the literature that a quantum electrodynamics (QED) treatment is necessary for a correct description of non-resonant scattering of ultrashort X-ray pulses from a dynamical electron system. Therefore, we also apply a QED description to treat resonant X-ray scattering, which allows us to take into account both elastic and inelastic processes. We find that scattering patterns also in the resonant case cannot be interpreted in terms of an instantaneous electron density.