SAMOP 2023 – scientific programme
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A: Fachverband Atomphysik
A 34: Ultrafast Dynamics III (joint session MO/A)
A 34.5: Talk
Friday, March 10, 2023, 15:30–15:45, F102
Photoemission chronoscopy of the Iodoalkanes — •Christian Schröder, Maximilian Pollanka, Pascal Scigalla, Andreas Duensing, Michael Mittermair, Maximilian Forster, Matthias Ostner, and Reinhard Kienberger — Physik Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
Photoemission timing measurements on primary and secondary iodoalkanes up to 2-iodobutane are performed in the gas phase and reveal an unexpected and yet unexplained dependency of the I4d photoemission time delay τI4d on the molecular species.
The experiment is is carried out at photon energies around the giant resonance in the I4d→ε f channel, which is expected to be largely indifferent to its chemical environment. If true, observable differences in the I4d photoemission time between molecules should be a direct consequence of differences experienced by the leaving photoelectron during its propagation alone, and not due to a distortion of its initial bound state.
We find a strong variation of τI4d between different molecules, but no clear correlation with the attached functional group’s size as it has been suggested by previous theoretical studies (S. Biswas et al., Nature Physics 16 (2020)).