Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 22: Interaction with VUV and X-ray light

A 22.10: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

An Experimental Setup for Multidimensional XUV/soft X-Ray Spectroscopy — •Lennart Aufleger, Thomas Ding, Marc Rebholz, Veit Stooß, Alexander Blättermann, Kristina Meyer, Christian Ott, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

In recent years multidimensional spectroscopy with visible and ultraviolet light has given insight into the structure and dynamics of electronic excitations in both atoms as well as in larger molecular systems. In particular the XUV spectral range is of high interest since it represents the photo-excitation region of spatially localized inner-valence electrons. However, due to the increased technical demands of creating adequate multi-pulse sequences in this energy domain and the low photon flux of laboratory-based sources, the extension of two-dimensional absorption spectroscopy to the XUV has, to the best of our knowledge, not yet been realized. Here we present an experimental setup for a multidimensional XUV/soft x-ray spectroscopy scheme suitable for both attosecond high-harmonic sources and ultra-intense free-electron lasers. The heart of the setup is a dynamic monolithic four-segment mirror generating four identical and temporally well-controlled pulses with independent time delays as well as high phase stability out of one incoming pulse, allowing 4-wave mixing experiments with both homodyne and heterodyne detection techniques. The next step will be the femtosecond-time-resolved and site-specific multidimensional spectroscopy of inner-valence electron excitation and charge migration in molecules as a function of time.