Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 27: XUV/X-ray Science

A 27.1: Vortrag

Mittwoch, 7. März 2018, 14:00–14:15, K 1.011

XUV-Pump/XUV-Probe Strong-field Transient Absorption of Neon at 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, Stefano Cavaletto¹, Zoltán Harman¹, 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 the free-electron laser FLASH. Applying our pump-probe scheme at photon energies around 50 eV, pulse durations of about 50 fs and intensities up to 10¹⁴ Wcm⁻² to neon, we traced the sequential two-photon ionization plus the excitation of one-photon bound-bound transitions within the doubly charged Ne²⁺ ion. Analyzing the nonlinear absorption spectra as a function of the pulse delay and the intensity reveals resonant XUV strong-field coupling of those transitions and allows to retrieve the FLASH coherence time from transient absorption spectra.