Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 40: Strong laser fields - III
A 40.3: Vortrag
Donnerstag, 8. März 2018, 15:00–15:15, K 2.019
Space-time-resolved UV-photoionization of rare gases — •Arne Baumann1,2, Oliver Schepp1,2, Dimitrios Rompotis4, Marek Wieland1,2,3, and Markus Drescher1,2,3 — 1Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany — 2Hamburg Centre for Ultrafast Imaging - CUI, Hamburg, Germany — 3Center for Free-Electron-Laser Science - CFEL, Hamburg, Germany — 4Deutsches Elektronensynchrotron - DESY, Hamburg, Germany
The photoionization of Kr and Xe is studied in the presence of a strong UV-field, where multi-photon and tunneling ionization lead to the formation of high charge states.
The experimental scheme is based on wave-front splitting of intense Ti:Sa third harmonic pulses at 268 nm and a colliding pulse geometry. Individual pulses are focused antiparallely into a gas target and ions created are imaged onto a position-sensitive detector, thus retrieving the spatial distribution of charged particles and mapping the temporal delay between both pulses onto a spatial coordinate.
In the case of Kr, high-lying Rydberg states, which are affected by strong AC-Stark shifts, are excited through 3-photon absorption, and interrogated by UV and IR pulses. By these means, different time-domain superpositions of the present fields are imaged simultaneously. The extracted durations of UV and IR pulses are in good agreement with values expected from the perturbative model.