Erlangen 2018 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 3: Photoelectron Spectroscopy
MO 3.5: Vortrag
Montag, 5. März 2018, 11:45–12:00, PA 2.150
Time-resolved photoelectron spectroscopy of deuterated Ethylene in the VUV with interferometric contrast — •Oliver Schepp1, Arne Baumann1, Marek Wieland1,2,3, and Markus Drescher1,2,3 — 1Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg — 2The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, 22761 Hamburg — 3Centre for Free-Electron-Laser Science, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg
Ethylene and its deuterated isotopologues are prototypical molecules for studying non-adiabatic dynamics in small organic systems. Irradiation in the vacuum ultraviolet spectral range gives access to π→π* excitation, followed by its ultrafast relaxation to the ground state through two conical intersections, including twisted-pyramidalization and proton migration.
Here we present a scheme using femtosecond vacuum ultraviolet pulses for both pump and probe in a co-propagating geometry enabling interferometric resolution for the pump probe signal [1]. The delay-dependent photoelectron spectra gives access to the ultrafast wavepacket dynamics on different time scales observed for different electron energies. Further, we observe a coherent beating pattern in the pump-probe signal which is attributed to the combined stretch and torsional modes of the C-C double bond.
[1] T. Gebert, D. Rompotis, M. Wieland, F. Karimi, A. Azima, M. Drescher, New J. Phys. 16 0170347 (2014).