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Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 39: Interaction with VUV and X-ray light

A 39.8: Vortrag

Freitag, 4. März 2016, 13:00–13:15, f303

Non-adiabatic relaxation of multi-electronic dynamics in benzene cations — •Martin Galbraith1, Christopher Smeenk1, Geert Reitsma1, Nickolai Zhavoronkov1, Jochen Mikosch1, Marc Vrakking1, Oleg Kornilov1, and Franck Lepine21Max-Born-Institut, Berlin, Germany — 2Institut Lumiere Matiere, Universite Lyon 1, Villeurbanne Cedex, France

We experimentally investigate ultrafast relaxation dynamics in benzene cations. Neutral benzene molecules are ionised by XUV photons produced by high harmonic generation. At higher XUV photon energies (ℏ ω > 15 eV) electron correlation effects begin to play a significant role leading to the excitation of satellite states. The relaxation dynamics of these electronic states are probed either by further excitation or ionisation with IR pulses. Previous theoretical studies predicted lifetimes for multiple states to be in the range of 10 fs. For this purpose the temporal resolution of the experiment was improved by IR pulse compression in a hollow-core fibre setup. This leads to XUV-IR cross correlations down to 6 fs. The non-adiabatic relaxation of the satellite states is found to occur on time scales of around 20 fs. The relaxation time scales accessed in this experiment have direct relevance to the recent theoretical investigations, which propose benzene as an interesting candidate for attosecond charge migration.

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