SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 34: Ultrafast Dynamics III (joint session MO/A)
A 34.7: Vortrag
Freitag, 10. März 2023, 16:00–16:15, F102
Dynamics of H2-roaming processes, H3+ formation, and cationic fragmentation in ethanol and aminoethanol initiated above and below the double-ionization threshold — •Aaron Ngai1, Jakob Asmussen2, Björn Bastian2, Matteo Bonanomi3, 4, Carlo Callegari5, Michele di Fraia5, Katrin Dulitz1,6, Raimund Feifel7, Sarang Ganeshamandiram1, Sebastian Hartweg1, Sivarama Krishnan8, Aaron LaForge9, Friedemann Landmesser1, Ben Ltaief Ltaief2, Moritz Michelbach1, Nitish Pal5, Oksana Plekan5, Nicolas Rendler1, Fabian Richter1, Audrey Scognamiglio1, Tobias Sixt1, Richard Squibb7, Akgash Sundaralingam2, Frank Stienkemeier1, and Marcel Mudrich2 — 1Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Germany — 2Department of Physics and Astronomy, Aarhus University, Denmark — 3Dipartimento di Fisica and CIMaINa, Universitá degli Studi di Milano, Italy — 4Istituto di Fotonica e Nanotecnologie, CNR-IFN, Milano, Italy — 5Elettra - Sincrotrone Trieste S.C.p.A., Basovizza, Trieste, Italy — 6Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Austria — 7Department of Physics, University of Gothenburg, Sweden — 8Department of Physics, Indian Institute of Technology Madras, Chennai, India — 9Department of Physics, University of Connecticut, US
The trihydrogen cation (H3+) is the simplest and one of the most abundant triatomic cation in the universe. It plays a crucial role in interstellar gas-phase chemistry as it facilitates molecule-forming chemical reactions. Building upon the work of Ekanayake [1], we further investigated the competition between pathways leading to H3+ formation in doubly ionized ethanol and 2-aminoethanol molecules and their respective clusters using time-resolved XUV-UV pump-probe spectroscopy. While formation of H3+ in doubly-ionized alcohol molecules is due to intramolecular H2-roaming, H3+ formation in clusters likely occurs via more complicated intermolecular pathways involving fragmentation and recombination of excited ionic fragments e.g. in nanoplasmas [2]. We compare results between XUV-photoionization below and above the double-ionization threshold, including the lifetimes of intermediate states. Notably, we report the absence of H3+-formation in aminoethanol, and the suppression of H2-roaming in ethanol clusters.
[1] Ekanayake, N. et al. Nature Comm. 9, 5186 (2018).
[2] Michiels, R. et al. Phys. Chem. Chem. Phys. 22, 7828 (2020).