Freiburg 2024 – scientific programme
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MO: Fachverband Molekülphysik
MO 26: Cluster
MO 26.6: Talk
Friday, March 15, 2024, 15:45–16:00, HS 3042
Electron transfer processes and the formation of solvated dielectrons by UV excitation in sodium-ammonia clusters — •Sebastian Hartweg1,2, Jonathan Barnes3, Bruce L. Yoder3, Gustavo A. Garcia2, Laurent Nahon2, Evangelos Miliordos4, and Ruth Signorell3 — 1Institute of Physics, University of Freiburg, Germany — 2Synchrotron Soleil, St. Aubin, France — 3DCHAB, ETH Zürich, Switzerland — 4Auburn University, Alabama, USA
Solvated electrons play important roles in the origin and formation of radiation damage in biological tissue as well as for large-scale chemical synthesis. Electron solvation has first been observed in alkali ammonia solutions. These systems with their many peculiar concentration dependent properties[1-3] including the formation of stable solvated dielectrons and a transition to a metallic phase, are not well understood on a molecular level, despite the many studies conducted on them.
I will present our recent photoelectron/photoion coincidence study with support from quantum chemical calculations[4], in which we could identify different electron transfer processes occurring in sodium ammonia clusters upon interaction with UV and VUV radiation. Among these processes, the formation of transient solvated dielectrons and their subsequent decay via an electron-transfer mediated decay process constitutes the first direct observation of solvated dielectrons.
1.Zurek, E., et al. Angew. Chem. Int. Ed., 2009. 48(44)
2.Buttersack, T., et al. Science, 2020. 368(6495)
3.Hartweg, S., et al. Angew. Chem. Int. Ed., 2016. 55(40)
4.Hartweg, S., et al. Science, 2023. 380(6650)
Keywords: solvated electron; ETMD; electron-transfer mediated decay; Photoelectron spectroscopy