Berlin 2014 – scientific programme
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MO: Fachverband Molekülphysik
MO 12: Experimental Techniques 2
MO 12.4: Talk
Wednesday, March 19, 2014, 15:00–15:15, BEBEL SR144
Femtosecond time-resolved photoelectron spectroscopy with XUV pulses in aqueous solution utilizing the liquid microjet technique — •Jan Metje1,2, Mario Borgwardt1,2, Alexandre Moguilevski1,2, Alexander Kothe1,2, Nicholas Engel1,2, Martin Wilke1,2, Ruba Al-Obaidi1,2, Daniel Tolksdorf1,2, Alexander Firsov3, Maria Brzhezinskaya3, Alexei Erko3, Igor Kiyan1,2, and Emad Flear Aziz1,2 — 1Joint Ultrafast Dynamics Lab in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin, Albert-Einstein-Str. 15, 12489 Berlin — 2Freie Universität Berlin, FB Physik, Arnimallee 14, 14195 Berlin — 3Institute for Nanometer Optics and Technology, Helmholtz-Zentrum Berlin, Albert-Einstein-Str. 15, 12489 Berlin
We present a newly built laser-based tabletop setup for time resolved photoelectron spectroscopy of liquids and dissolved molecules. The system provides femtosecond extreme ultraviolet (XUV) light generated as high harmonic (HHG) from a titanium sapphire laser as the probe. The spatial, spectral, and temporal characteristics of the XUV beam are presented. Monochromatization of the XUV light with minimum temporal pulse distortion is the central issue of this work. Off-center reflection zone plates are shown to be superior to gratings when selection of a desired harmonic is carried out with the use of a single optical element. A cross-correlation technique was applied to characterize the performance of the zone plates in the time domain. By using laser pulses of 25 fs length to pump the HHG process, a pulse duration of 45 fs for monochromatized harmonics was achieved.