Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 28: Poster: Interaction with VUV and X-ray light II

A 28.14: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

An Experimental Setup for Multidimensional Soft X-Ray Spectroscopy — •Thomas Ding, Marc Rebholz, Faiq Bakar, Paul Birk, Kristina Meyer, Andreas Kaldun, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

Information on both the structure and the dynamics of quantum systems is encoded in their optical-response spectra. In recent years multidimensional visible and ultraviolet spectroscopy has shed light on electronic/exciton dynamics in large molecular systems. However, due to the failure of standard optical elements for higher frequencies, the extension to the extreme ultraviolet or x-ray range to observe electronic core-level dynamics has not yet been realized. Here, we present an experimental design and first proof-of-principle results of a multidimensional soft x-ray spectroscopy scheme applicable for both attosecond high-harmonic sources and ultra-intense free-electron lasers. The heart of the setup is a dynamical soft x-ray-compatible four-segment split mirror to generate temporarily well-controlled multi-pulse sequences in a noncollinear box geometry for four-wave mixing. In the near future, one key application will be the time-resolved and site-specific spectroscopy of core- and valence-electron dynamics and the correlated electronic motion inside molecules.