Erlangen 2018 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 13: Posters 1: Ultrafast Spectroscopy

MO 13.19: Poster

Dienstag, 6. März 2018, 16:15–18:15, Orangerie

Studies of atomic and molecular dynamics with few-femtosecond XUV and IR fieldsLorenz Drescher, Geert Reitsma, Tobias Witting, Marc Vrakking, and •Jochen Mikosch — Max-Born-Institute, Max-Born-Strasse 2A, 12489 Berlin

Atomic and molecular dynamics on attosecond and few-femtosecond timescales can be studied using a number of different protocols involving few-cycle infrared (IR) pulses and extreme ultraviolett (XUV) pulses from High Harmonic Generation.

Here we showcase the results from three different experiments performed with the same versatile experimental apparatus:

(1) The few-femtosecond passage of conical intersections in benzene was studied with time-resolved photofragment spectroscopy. The dynamics represent one of the fastest internal conversion processes in a molecule studied to date and allow for a detailed comparison with multi-configurational time-dependent Hartree calculations [1].

(2) We analyze the XUV-IR induced excitation of neutral states in helium by UV photoelectron spectroscopy. The observed oscillation of the 1s3p population with the XUV-IR phase is assigned to the superposition of two independent two-color two-pathway interferences, which are out-of-phase.

(3) Finally, we present results from attosecond transient absorption spectroscopy of CH3I molecules in the core-to-valence and core-to-Rydberg transition region. Our results show the sub-cycle dependent light-induced coupling of these states due to the AC Stark effect.

[1] Galbraith et al., Nature Comm. 8, 1018 (2017)

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