Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 15: Femtosecond Spectroscopy 3
MO 15.4: Vortrag
Donnerstag, 3. März 2016, 12:00–12:15, f102
Second order interferometric gas-phase autocorrelation in the VUV — •Oliver Schepp1, Arne Baumann1, Thomas Gebert1,2,3, Dimitrios Rompotis1, Marek Wieland1,2,3, and Markus Drescher1,2,3 — 1Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, 22761 Hamburg, Germany — 3Centre for Free-Electron-Laser Science, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
We studied the ultrafast photodissociation dynamics of molecules in an VUV-pump VUV-probe scheme using a Michelson-type all-reflective interferometric autocorrelator realized with two moveable interdigitated reflective gratings. An imaging time-of-flight spectrometer is used for separating ions formed in different diffraction orders in the focal plane. In the setup, 18 fs VUV pulses centered at 161.8 nm are created in a variable-length gas cell driven by a Ti:Sa laser and spectrally selected for driving non-resonant two-photon ionization processes. With the fringe-resolved 2nd order autocorrelation in Kr the pulse duration of the VUV pulses was determined. With well-characterized VUV pulses, photo-reaction dynamics of molecular gas targets like O2 are studied.