Bonn 2025 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 28: Ultrafast Dynamics IV
MO 28.3: Vortrag
Freitag, 14. März 2025, 11:30–11:45, HS XVI
Time resolved attosecond photoemission of isosteric molecules — •Maximilian Pollanka1, Christian Schröder1, Maximilian Forster1, Pascal Freisinger1, Sven-Joachim Paul1, Zdenek Masin2, Jakub Benda2, and Reinhard Kienberger1 — 1Physik-Department, Technische Universität München, Garching, Germany — 2Institute of Theoretical Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
In this work we report on the absolute photoemission timing of the outer valence states in the isosteric molecules CO2 and N2O utilizing attosecond streaking spectroscopy. We investigated on the photon energy dependant emission times using helium and iodomethane as a timing reference. Employing the time-dependant R-matrix approach, the channel-coupling effect turned out to be a significant delay contribution in CO2 due to the resonant coupling of the NIR field with the B and C states separated by 1.3 eV. Based on the theoretical calculations we could disentangle the respective delay contribution of single states in an experimentally accessible mixed state, where in both modecules the Π orbital turned out to be the dominant electron supplier. By comparing the absolute photoemission times retrieved with both chronoscopes He and CH3I, we could proof the validity of using He1s as well as I4d as complementary reference photolines. The great agreement of the absolute delays obtained with both timing references make us confident for further exploiting the I4d in prospective absolute timing experiments of outer valence states in molecules.
Keywords: attosecond streaking spectroscopy; time-resolved photoemission in molecules; absolute photoemission time delays