Erlangen 2022 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 8: Poster 1
MO 8.1: Poster
Dienstag, 15. März 2022, 16:30–18:30, P
Two-color X-ray pump-probe experiments with halogenized hydrocarbons — •Alice Judt1, Julius Schwarz1, Fabiano Lever2, Aljoscha Roerig3, Karolin Baev4, Dennis Mayer2, Ivan Baev1, Matz Nissen1, Steffen Palutke4, Markus Guehr2, Markus Drescher1, Marion Kuhlmann4, Michael Meyer3, Matthias Dreimann5, Helmut Zacharias5, and Michael Martins1 — 1Universität Hamburg, Hamburg, Germany — 2Universität Potsdam, Potsdam, Germany — 3European XFEL, Schenefeld, Germany — 4Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany — 5Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Münster, Germany
Charge transfer on the fs time scale is the basis to understand chemical reactions in molecules. A time resolved two-color XUV-pump/XUV-probe method was used to analyze this process in ClBrCH2, ClBrC2H4 and ClBrC3H6 molecules. A short 100 fs 70 eV XUV pump pulse excites a Br 3d electron, inducing a relaxation process within the molecule including charge transfer from Br to Cl. By exciting a chlorine 2p electron with a second (probe) pulse of 210 eV, information about the electronic rearrangement can be obtained.
The experiment was carried out at the FL24 beamline of the free-electron laser FLASH2 at DESY using the new split-and-delay unit. A magnetic bottle electron spectrometer was used to measure the kinetic energy of the electrons. First results and a preliminary analysis of resonant molecular excitations using small pump-photon energy variations will be discussed.