Erlangen 2022 – scientific programme

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MO: Fachverband Molekülphysik

MO 10: XUV-spectroscopy

MO 10.7: Talk

Wednesday, March 16, 2022, 12:00–12:15, MO-H6

Molecular environments in the time-domain — •Christian Schröder, Maximilian Pollanka, Pascal Scigalla, Michael Mittermair, Andreas Duensing, Martin Wanckel, and Reinhard Kienberger — Chair for laser and X-ray physics E11, Technische Universität München, Germany

We report on photoemission timing measurements performed on small iodine-substituted organic molecules in the gas phase. The iodine atom’s 4d photoemission serves as an intra-molecular timing reference which is clocked against the accurately known He1s photoemission.

Using the iodine atom as an intra-molecular reference is motivated by the presence of a giant resonance in the I4d→ε f photoemission channel which is expected to be largely unaffected by its chemical environment. Therefore, in proximity to the resonance, any difference in the observable photoemission delay between different molecules is expected to a consequence of the differences in molecular environment experienced by the leaving photoelectron wavepacket during its propagation through the molecular potential landscape.

We complement our findings with scattering calculations in order to gain deeper insight into the relationship between the observable photoemission time and molecular geometry, the photoelectron angular distribution and the role of the molecule’s orientation during the experiment, thereby paving the road towards establishing photoemission timing experiments as an efficient and accurate means to study molecular environments.