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MO: Fachverband Molekülphysik
MO 29: Cluster and Nanoparticles II (joint session MO/A)
MO 29.4: Vortrag
Freitag, 14. März 2025, 12:00–12:15, HS XV
Relaxation of solvated electrons in the presence of ammonia orbital vacancies — •Aaron Ngai1, Dominique Dominique2, Lukas Bruder1, Wentao Chen1, Aleksandr Demianenko1, Michele Di Fraia3, Katrin Dulitz4, Ioannis Makos1, Evangelos Miliordos5, Sitanath Mondal1, Oksana Plekan6, Sooraj Rajendran1, Fabian Richter1, Niklas Scheel7, Brendan Wouterlood1, Bruce Yoder2, Carlo Callegari6, Marcel Mudrich7, Giuseppe Sansone1, Ruth Signorell2, Frank Stienkemeier1, and Sebastian Hartweg1 — 1Institute of Physics, University of Freiburg, Germany — 2Department of Chemistry and Applied Biosciences, ETH Zürich, Switzerland — 3CNR - Istituto Officina dei Materiali (IOM), S.S. 14, Km 163.5, 34149 Trieste, Italy — 4Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Austria — 5Department of Chemistry and Biochemistry, Auburn University, AL, US — 6Elettra - Sincrotrone Trieste S.C.p.A., Basovizza, Trieste, Italy — 7Department of Physics and Astronomy, Aarhus University, Denmark
Solvated electrons in alkali-metal ammonia solutions are fascinating species that motivate fundamental and applied studies from different fields of research. In synthetic chemistry, these solvated electrons are used as powerful reducing agents in challenging reduction reactions [1]. From a physical perspective, they exhibit peculiar concentration-dependent properties and processes, such as the spin-pairing of solvated electrons and the phase transition to a metallic state at high concentrations [2]. Recently, a photoionization study of sodium-doped ammonia clusters, revealed the production of low-energy electrons from electron-transfer mediated decay of solvated electron pairs formed by optical excitation [3]. Motivated by the observation of this optically-triggered autoionization process, we performed a time-resolved photoelectron spectroscopy study of sodium-doped ammonia clusters with extreme ultraviolet radiation at the free-electron laser FERMI. I will present preliminary results of this study, which reveals the dynamics of solvated electrons in the vicinity of ammonia valence shell vacancies and the effects of excitations induced by ultraviolet light in these fascinating cluster systems.
[1] Birch, A.J. J. Chem. Soc., 0, 430-436 (1944)
[2] Zureck, E. et al. Angew. Chem. Int. Ed. 48, 44 (2009)
[3] Hartweg, S. et al. Science 380, 6650 (2023)
Keywords: FEL; XUV; Solvated electrons; pump-probe; FERMI