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A: Fachverband Atomphysik

A 24: Poster: Interaction with VUV and X-ray light

A 24.6: Poster

Mittwoch, 14. März 2012, 16:30–19:00, Poster.V

Time-dependent theory of strong-field x-ray resonance fluorescence — •Stefano M. Cavaletto¹, Christian Buth², Zoltán Harman^1,3, and Christoph H. Keitel¹ — ¹Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany — ²Argonne National Laboratory, Argonne, Illinois 60439, USA — ³ExtreMe Matter Institute EMMI, Planckstrasse 1, D-64291 Darmstadt, Germany

Resonance fluorescence is the emission of photons scattered off by atoms and molecules driven by a near-resonant external electric field; it is a cornerstone of x-ray spectroscopy and x-ray quantum optics. For intense x rays like those provided by existing and upcoming XFELs, the stimulated excitation and recombination at the Rabi frequency can compete with radiative and Auger decay. The signature of Rabi flopping in the electron spectrum of resonant Auger decay was studied for a two-level model of neon cations driven strongly by LCLS light tuned to the 1s  2p⁻¹ → 1s⁻¹  2p transition at 848 eV [1, 2]. Because of the advantages of photon detection over electron detection, we perform a time-dependent study of the spectrum of resonance fluorescence for neon cations, by considering two different scenarios, i.e. the chaotic pulses presently generated at LCLS and the coherent pulses which are going to become available in the near future via seeding techniques.
[1] N. Rohringer and R. Santra, Phys. Rev. A 77, 053404 (2008).
E. P. Kanter et al., Phys. Rev. Lett. 107, 233001 (2011).