Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 26: Poster Session II
A 26.33: Poster
Wednesday, March 8, 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.