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MO: Fachverband Molekülphysik
MO 9: Posters 1: Dichroism, VUV and Xray, Clusters, and Cold Molecules
MO 9.9: Poster
Dienstag, 7. März 2017, 17:00–19:00, P OG1
Ultafast photodissociation of small molecules studied by interferometric VUV-VUV pump-probe experiments — 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
Ultrafast photoreaction dynamics of small molecules are studied in the time domain, using a single-color VUV-pump/ VUV-probe scheme [1]. 17-fs VUV-pulses, centered at 161 nm with pulse energies up to 1.1 μJ created with high harmonic generation are split by two moveable interdigitated double comb mirrors into two collinearly propagating replicas with a variable delay [2,3]. This Michelson-type all-reflective interferometric autocorrelation scheme is used for recording the time-depended pump-probe signal with simultaneous non-resonant two-photon ionization of krypton as a precise timing-reference. The photoreaction dynamics are probed via one and two VUV photon absorption, enabling different observables for the pump-probe signal which expands intrinsic limitations in observation of the molecular wavepacket. Additional spectral information obtained by the interferometric resolution give access to the involved harmonic orders and the order of nonlinearity.
[1] Schepp, O. et. al., Phys Rev. A 94, 033411 (2016)
[2] Rompotis, D. et. al., Opt. Lett. 50 1675 (2015)
[3] Gebert, T., et al., New J. Phys. 16 0170347 (2014)