Freiburg 2024 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 43: Ultrafast Dynamics III and High-harmonic Generation (joint session MO/A)

A 43.2: Vortrag

Freitag, 15. März 2024, 14:45–15:00, HS 3044

Isosteric molecules in the time-domain — •Maximilian Pollanka, Christian Schröder, Maximilian Forster, and Reinhard Kienberger — Physik Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany

We report on absolute photoemission timing measurements on isosteric molecules in the gas phase. Photoemission time delays are accessed via streaking spectroscopy on attosecond timescales. To be able to (directly) access absolute photoemission times of the respective outer and inner valence states of N2O and CO2 we are using iodomethane (I4d) as a timing reference. In a complementary study He was used as reference to cross-check the results as well as to verify the usability of the respective chronoscope species. Due to the similarities in molecular structure (isostericity) and electronic configurations (isoelectronicity) between these investigated molecules, the pure effect of the specific molecular/orbital characteristics is expected to be probed. Additionally, N2 and CO is studied in the same way on the basis of their isosteric behavior. The experimental data show great similar tendencies but also differences between the compared molecular orbitals, which are determined but not completely understood up to now. Nonetheless, recent theoretical calculations hint towards an additional channel coupling photoemission time delay contribution that can be assigned to electron correlations responsible for re-disturbing the excitation among different final photoionization channels.

Keywords: attosecond physics; photoemission time delay; attosecond streaking spectroscopy