Mainz 2026 – scientific programme
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MO: Fachverband Molekülphysik
MO 5: Ultrafast Electronic Dynamics
MO 5.4: Talk
Monday, March 2, 2026, 18:00–18:15, P 204
New insight into photoionization by attosecond spectroscopy of isosteric molecules — •Maximilian Pollanka1, Maximilian Forster1, Sven-Joachim Paul1, Zdenek Masin2, Jakub Benda2, and Reinhard Kienberger1 — 1School of Natural Sciences, Chair for Laser- and X-ray physics, Technische Universität München, Garching, Germany — 2Institute of Theoretical Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czechia
Our work addresses time-resolved photoemission in molecules. To this end, the four isosteric di-and tri-atomic molecules CO, N2, CO2, and N2O are investigated in complementary studies and compared with each other. By using suitable chronoscopes in combination with the attosecond streaking spectroscopy method, it is possible not only to determine relative photoemission times between different electronic states but also to access absolute photoemission delays. Together with theoretical considerations and simulations, the experimentally obtained results can be discussed and explained. This measurement method is applied to four molecules that are almost identical in their electronic states, molecular orbitals, and number of outer valence electrons, which is described by the term isosterism. The chronoscopes iodomethane (I4d state) and helium (He1s state) are not only used as a reference to gain access to the absolute photoemission times, but the results obtained in separate experiments are also used to verify the validity of the unrestricted use of both. Together with theoretical support, the physical processes underlying photoemission in these isosteric molecules could finally be deciphered and interpreted.
Keywords: attosecond streaking spectroscopy; absolute photoemission time delays; electron correlations; isosteric molecules