Journal Article

PUBDB-2021-02839

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png XUV pump–XUV probe transient absorption spectroscopy at FELs

Ding, T. (Corresponding author)Extern* ; Rebholz, M.Extern* ; Aufleger, L.Extern* ; Hartmann, M.Extern* ; Stooß, V.Extern* ; Magunia, A.Extern* ; Birk, P.Extern* ; Borisova, G. D.Extern* ; da Costa Castanheira, C.Extern* ; Rupprecht, P.Extern*XFEL.EU* ; Mi, Y.Extern* ; Gaumnitz, T. ; Loh, Z.-H.Extern* ; Roling, S.XFEL.EU* ; Butz, M.Extern* ; Zacharias, H.Extern* ; Düsterer, S.XFEL.EU*DESY* ; Treusch, R.DESY* ; Ott, C.Extern* ; Pfeifer, T.Extern*

2021
Soc. Cambridge [u.a.]

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Please use a persistent id in citations: doi:10.1039/D0FD00107D  doi:10.3204/PUBDB-2021-02839

Abstract: 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.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. FLASH Wissenschaftlicher Nutzerbetrieb (FS-FLASH-O)
3. FLASH Photonen-Diagnose und Steuerungen (FS-FLASH-D)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)

Experiment(s):

1. FLASH Beamline BL2 (FLASH)

Appears in the scientific report 2021

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Database coverage:
; ; ; Allianz-Lizenz / DFG ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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