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Hannover 2020 – scientific programme

The DPG Spring Meeting in Hannover had to be cancelled! Read more ...

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A: Fachverband Atomphysik

A 23: Interaction with VUV and X-ray light I

A 23.5: Talk

Thursday, March 12, 2020, 12:15–12:30, f107

XUV Transient Absorption Spectroscopy on Neon at FLASH — •Thomas Ding1, Marc Rebholz1, Lennart Aufleger1, Maximilian Hartmann1, Kristina Meyer1, Alexander Magunia1, David Wachs1, Veit Stooß1, Paul Birk1, Gergana Borisova1, Patrick Rupprecht1, Yonghao Mi1, Andrew Attar2, Thomas Gaumnitz3, Zhi Heng Loh4, Sebastian Roling5, Marco Butz5, Helmut Zacharias5, Stefan Düsterer6, Rolf Treusch6, Stefano Cavaletto1, Christian Ott1, and Thomas Pfeifer11Max 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 transient absorption spectroscopy employing extreme ultraviolet (XUV) pump and probe pulses delivered by the free-electron laser FLASH. We target the neon atom and trace its nonlinear XUV (photon energy 50 eV) interaction with joint high spectral and temporal resolution. This allows us to trace the time-dependent sequential two-photon ionization of neon, transient (2.4-fs time scale) coherence effects near resonances in the produced doubly-charged neon ions (Ne2+), and the XUV-induced Stark shift of those ionic resonances. Furthermore, we show how this technique can be used to measure the frequency chirp of XUV-FEL pulses.

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