%0 Journal Article
%A Ding, Thomas
%A Rebholz, Marc
%A Aufleger, Lennart
%A Hartmann, Maximilian
%A Stooß, Veit
%A Magunia, Alexander
%A Birk, Paul
%A Borisova, Gergana Dimitrova
%A da Costa Castanheira, Carina
%A Rupprecht, Patrick
%A Mi, Yonghao
%A Gaumnitz, Thomas
%A Loh, Zhi-Heng
%A Roling, Sebastian
%A Butz, Marco
%A Zacharias, Helmut
%A Düsterer, Stefan
%A Treusch, Rolf
%A Ott, Christian
%A Pfeifer, Thomas
%T XUV pump–XUV probe transient absorption spectroscopy at FELs
%J Faraday discussions
%V 228
%@ 1364-5498
%C Cambridge [u.a.]
%I Soc.
%M PUBDB-2021-02839
%P 519 - 536
%D 2021
%X The emergence of ultra-intense extreme-ultraviolet (XUV) and X-ray free-electron lasers (FELs) has opened the door for the experimental realization of non-linear XUV and X-ray spectroscopy techniques. Here we demonstrate an experimental setup for an all-XUV transient absorption spectroscopy method for gas-phase targets at the FEL. The setup combines a high spectral resolving power of E/ΔE ≈ 1500 with sub-femtosecond interferometric resolution, and covers a broad XUV photon-energy range between approximately 20 and 110 eV. We demonstrate the feasibility of this setup firstly on a neon target. Here, we intensity- and time-resolve key aspects of non-linear XUV-FEL light–matter interactions, namely the non-resonant ionization dynamics and resonant coupling dynamics of bound states, including XUV-induced Stark shifts of energy levels. Secondly, we show that this setup is capable of tracking the XUV-initiated dissociation dynamics of small molecular targets (oxygen and diiodomethane) with site-specific resolution, by measuring the XUV transient absorption spectrum. In general, benefitting from a single-shot detection capability, we show that the setup and method provides single-shot phase-locked XUV pulse pairs. This lays the foundation to perform, in the future, experiments as a function of the XUV interferometric time delay and the relative phase, which enables advanced coherent non-linear spectroscopy schemes in the XUV and X-ray spectral range.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 33575691
%U <Go to ISI:>//WOS:000664793300026
%R 10.1039/D0FD00107D
%U https://bib-pubdb1.desy.de/record/459956