Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 33: Interaction with strong or short laser pulses III

A 33.5: Vortrag

Donnerstag, 3. März 2016, 12:15–12:30, f303

Towards multidimensional spectroscopy in the XUV and soft-X-ray spectral range — •Thomas Ding, Kristina Meyer, Christian Ott, Andreas Kaldun, Alexander Blättermann, Veit Stooss, Marc Rebholz, Lennart Aufleger, Paul Birk, Maximilian Hartmann, Martin Laux, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

As first steps towards multidimensional spectroscopy with extreme ultraviolet (XUV) pulses, we present time-resolved four-wave-mixing experiments on inner-valence transitions in neon with attosecond XUV and femtosecond near-infrared (NIR) pulses. The first two pulses (XUV-NIR) coincide in time and act as coherent excitation fields, while the third pulse (NIR) acts as a probe. This new approach allows for the coherent control of otherwise inaccessible coupling dynamics between odd- and even-parity states.

In addition, we present the design of a multidimensional XUV/soft-X-ray spectroscopy setup which will be applicable for both attosecond high-harmonic sources and ultra-intense free-electron lasers (FELs). The heart of the setup is a dynamic four-quadrant split mirror to generate temporally well-controlled pulse sequences for four-wave-mixing experiments as a function of multiple time delays. First experiments will again target benchmark systems such as helium, neon and small molecules. In the near future, one key application with FEL pulses will be the femtosecond-time-resolved multidimensional site-specific spectroscopy of molecules to follow charge migration as a function of time.