Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 4: Coulomb-explosion Imaging (joint session MO/A)
A 4.2: Talk
Monday, March 11, 2024, 11:30–11:45, HS 3044
Dynamics of H2-roaming processes, H3+ formation in ethanol and aminoethanol initiated by two-photon double-ionization — •Aaron Ngai1, Sebastian Hartweg1, Jakob Asmussen2, Björn Bastian3, Ltaief Ben Ltaief2, Matteo Bonanomi4, 5, Carlo Callegari6, Michele di Fraia6, Katrin Dulitz7, Raimund Feifel8, Sarang Ganeshamandiram1, Sivarama Krishnan9, Aaron LaForge10, Landmesser Friedemann1, Michelbach Moritz1, Pal Nitish6, Plekan Oksana6, Rendler NicNicolas1, Richter Fabian1, Scognamiglio Audrey1, Sixt Tobias1, Squibb Richard8, Sundaralingam Akgash2, Stienkemeier Frank1, and Mudrich Marcel2 — 1Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany — 2Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark — 3Wilhelm Ostwald Institute for Physical and Theoretical Chemistry, University of Leipzig, Leipzig, Germany — 4Dipartimento di Fisica Politecnico, Milano, Italy — 5Istituto di Fotonica e Nanotecnologie (CNR-IFN) Milano, Italy — 6Elettra - Sincrotrone Trieste S.C.p.A., Basovizza, Trieste, Italy — 7Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria — 8Department of Physics, University of Gothenburg, Göteborg, Sweden — 9Department of Physics, Indian Institute of Technology Madras, Chennai, India — 10Department of Physics, University of Connecticut, Storrs, Connecticut, US
The trihydrogen cation (H3+) is the simplest and one of the most abundant triatomic cations in the universe. It plays a crucial role in interstellar gas-phase chemistry as it facilitates molecule-forming chemical reactions. Dynamics in simple alcohols that lead to H3+ formation typically involve the unusual so-called "roaming"-mechanism of a neutral H2 moiety. In comparison to previous experiments using strong-field ionization by infrared (IR) pulses [1], we produce dicationic ethanol and 2-aminoethanol molecules using two-photon double-ionization with extreme ultraviolet (XUV) light, and probe the dynamics of H3+ formation with a visible (VIS) pulse in a time-resolved pump-probe scheme. We compare results between measurements with XUV photons either below or above the double-ionization threshold, including the lifetimes of intermediate states.
[1] Ekanayake, N. et al. Nat. Commun. 9, 5186 (2018)
Keywords: XUV; Pump-probe; Roaming; Chemical dynamics; Free-Electron-Laser