Berlin 2014 – wissenschaftliches Programm
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K: Fachverband Kurzzeitphysik
K 2: Strahlungsquellen und deren Anwendungen - Attosekundenexperimente
K 2.5: Vortrag
Montag, 17. März 2014, 17:45–18:00, SPA SR203
Femtosecond Time-Resolved Photoelectron and Photoion Studies of Perylene with High-Order Harmonics — •Markus Koch1,2, Jakob Grilj1,3, Emily Sistrunk1, Thomas J. A. Wolf1, and Markus Gühr1 — 1PULSE, SLAC National Accelerator Laboratory, Menlo Park, CA 94305, USA — 2Institute of Experimental Physics, Graz University of Technology, A-8010 Graz, Austria — 3Ecole Polytechnique Federale de Lausanne EPFL, CH-1015, Switzerland
We present femtosecond pump-probe photoelectron and -ion spectra of perylene collected with a novel set-up. After excitation to the S1 state with 400 nm ionization is achieved either by a multi photon transition with the 800 nm fundamental or with a single photon obtained from high-order harmonic generation (HHG). In the latter case we isolate the 9th harmonic (89 nm, 14 eV) using an In metal filter in combination with an Al mirror. Characterization of the spectrometer reveals cross correlations of about 75 fs for both 800 nm and 89 nm probe pulses, indicating that the duration of the HHG pulse does not limit the time resolution. The energy resolution obtained with the 9th harmonic is 200(20) meV.
In perylene we observe excited state dynamics with a 1 ps time constant. For 800 nm multiphoton probe ionization both the ion yield and the order of the ionizing transition (number of photons) change with pump-probe delay. In 9th harmonic probe photoelectron spectra the 400 nm pump excitation is observed as energy shift of photoelectron lines.