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A: Fachverband Atomphysik

A 26: Poster Session II

A 26.33: Poster

Mittwoch, 8. März 2017, 17:00–19:00, P OG1

XUV-Pump-Probe Transient Absorption Spectroscopy on Neon at the Free Electron Laser in Hamburg (FLASH) — •Thomas Ding¹, Marc Rebholz¹, Lennart Aufleger¹, Maximilian Hartmann¹, Kristina Meyer¹, Alexander Magunia¹, David Wachs¹, Veit Stooß¹, Paul Birk¹, Gergana Borisova¹, Andrew Attar², Thomas Gaumnitz³, Zhi Heng Loh⁴, Sebastian Roling⁵, Marco Butz⁵, Helmut Zacharias⁵, Stefan Düsterer⁶, Rolf Treusch⁶, Christian Ott¹, and Thomas Pfeifer¹ — ¹Max-Planck Institut für Kernphysik, Heidelberg, Germany — ²University of California Berkeley, Berkeley, USA — ³Eidgenössische Technische Hochschule Zürich, Zürich, Switzerland — ⁴Nanyang Technological University Singapore, Singapore — ⁵Westfälische Wilhelms-Universität Münster, Münster, Germany — ⁶Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany

We present first transient-absorption spectroscopy experiments with extreme ultraviolet (XUV) pump and probe pulses delivered by FLASH. Applying our pump-probe scheme at photon energies around 50 eV and pulse durations of about 50 fs to neon, we traced strong-field-induced spectral modifications in the bound-electron response of the neutral and the ionized atom. The method also provides in-situ temporal diagnostics of self-amplified spontaneous emission (SASE) FEL pulses from the measured spectral cross-correlation signatures. In the near future, this scheme will be extended to a multi-pulse nonlinear spectroscopy technique to probe the excitation transfer and electronic redistribution dynamics among different sites of a molecule.