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MO: Fachverband Molekülphysik
MO 10: XUV-spectroscopy
MO 10.4: Talk
Wednesday, March 16, 2022, 11:15–11:30, MO-H6
X-ray absorption spectroscopy of the hydronium cation — •Julius Schwarz1, Fridtjof Kielgast1, Ivan Baev1, Simon Reinwardt1, Florian Trinter2, Stephan Klumpp3, Sadia Bari3,4, Alexander Perry-Sassmanshausen5, Ticia Buhr5, Stefan Schippers5, Alfred Müller5, and Michael Martins1 — 1Universität Hamburg, Hamburg, Germany — 2Goethe- Universität Frankfurt am Main, Frankfurt am Main, Germany — 3Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 4Rijksuniversiteit Groningen, Groningen, The Netherlands — 5Justus-Liebig-Universität Gießen, Gießen, Germany
Facilitated by the hydrogen-bond network of water, protons in liquid water are diffused at a rapid rate, with several possible explanations invoking the hydronium cation H3O +. Among the many ways of gaining knowledge about H3O +, the method of soft X-ray absorption spectroscopy has been established as a valuable analysis tool for ionic molecules and clusters [1].
We report the use of a flowing afterglow ion source to record the soft X-ray absorption spectrum of the hydronium H3O + cation at the O 1s edge using the photon ion spectrometer (PIPE) at the synchrotron lightsource PETRA III in Hamburg [2]. H2O + cations have been analyzed for comparison. The spectra show significant shifts in resonance energies and widths compared to neutral H2O and relative to each other.
[1] Martins et al., J. Phys. Chem. Lett., 12 5 (2021), 1390–1395
[2] S. Schippers et al., X-Ray Spectrometry, 49 11 (2020)