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MO: Fachverband Molekülphysik
MO 10: Highly Excited Molecules and Clusters
MO 10.3: Vortrag
Mittwoch, 8. März 2017, 15:15–15:30, N 6
Single-Shot Pump-Probe Studies in a Two Color (V)UV Field — •Arne Baumann1,2, Oliver Schepp1, Dimitrios Rompotis3, Armin Azima1, Marek Wieland1,2,4, and Markus Drescher1,2,4 — 1Institut für Experimentalphysik, Universität Hamburg, Hamburg, Deutschland — 2Hamburg Centre for Ultrafast Imaging - CUI, Hamburg, Deutschland — 3Deutsches Elektronensynchrotron - DESY, Hamburg, Germany — 4Center for Free-Electron-Laser Science - CFEL, Hamburg, Germany
To gain a complete picture of few-femtosecond (V)UV-induced reactions delay-dependent ionization of parent and fragment ions by weak probe photons is an excellent tool. The presented single-shot pump-probe scheme is based on wave-front splitting of intense harmonic radiation of a Ti:Sa laser system. Individual pulses are focused anti-parallely into a gas target and ions created are imaged onto a position-sensitive detector, thus mapping the temporal delay between both pulses onto a spatial coordinate. By using different dielectric mirrors and/or filters for each pulse, a two-color cross-correlation and pump-probe experiment is realized, benefiting from single-shot acquisition capabilities.
The multiphoton UV-dissociation dynamics of formaldehyde have been studied with an intense 5th harmonic (161.8 nm) probe after irradiation at 269.7 nm. The 7.7 eV probe enables studies of the delay-dependent dissociative ion-yield for various fragments of this dissociation reaction in a perturbative approach.