SAMOP 2023 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 6: Poster I

MO 6.8: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

THz-Streaking for Detecting Inner-valence-shell Correlation-induced Time-delays in the Ionization of PAHs. — •Mohamed Abdelrasoul, Mark Prandolini, Marek Wieland, and Markus Drescher — Institute of Experimental Physics, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.

Photoionization delays (Wigner time delay) in outer molecular shells occur in the range of a few ten attoseconds. This delay increases for inner valence shell photoionization due to strong correlation effects, namely, shake-up/down and knock-up/down processes, leading to markedly longer relaxation times, and raising an interesting question: how long does it take to remove an electron from the molecular inner shell relative to the outermost shell? Most polycyclic aromatic hydrocarbons (PAHs) have relatively high photoelectron emission cross sections in the energy range typically between 15 and 25 eV, and to access both inner and outer photoelectron spectra, an Extreme Ultraviolet (XUV) photon energy in that range is required. A laser-based setup is presented, combining a high harmonic XUV source with THz streaking for measuring the photoelectron emission delay in PAHs of different sizes.