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Probing hydrogen bond strength in liquid water by resonant inelastic X-ray scattering

Vinícius Vaz da Cruz (), Faris Gel’mukhanov, Sebastian Eckert, Marcella Iannuzzi, Emelie Ertan, Annette Pietzsch, Rafael C. Couto, Johannes Niskanen, Mattis Fondell, Marcus Dantz, Thorsten Schmitt, Xingye Lu, Daniel McNally, Raphael M. Jay, Victor Kimberg, Alexander Föhlisch and Michael Odelius ()
Additional contact information
Vinícius Vaz da Cruz: Royal Institute of Technology
Faris Gel’mukhanov: Royal Institute of Technology
Sebastian Eckert: Universität Potsdam
Marcella Iannuzzi: University of Zürich
Emelie Ertan: Stockholm University, AlbaNova University Center
Annette Pietzsch: Helmholtz-Zentrum Berlin für Materialien und Energie
Rafael C. Couto: Royal Institute of Technology
Johannes Niskanen: Helmholtz-Zentrum Berlin für Materialien und Energie
Mattis Fondell: Helmholtz-Zentrum Berlin für Materialien und Energie
Marcus Dantz: Paul Scherrer Institut
Thorsten Schmitt: Paul Scherrer Institut
Xingye Lu: Paul Scherrer Institut
Daniel McNally: Paul Scherrer Institut
Raphael M. Jay: Universität Potsdam
Victor Kimberg: Royal Institute of Technology
Alexander Föhlisch: Universität Potsdam
Michael Odelius: Stockholm University, AlbaNova University Center

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Local probes of the electronic ground state are essential for understanding hydrogen bonding in aqueous environments. When tuned to the dissociative core-excited state at the O1s pre-edge of water, resonant inelastic X-ray scattering back to the electronic ground state exhibits a long vibrational progression due to ultrafast nuclear dynamics. We show how the coherent evolution of the OH bonds around the core-excited oxygen provides access to high vibrational levels in liquid water. The OH bonds stretch into the long-range part of the potential energy curve, which makes the X-ray probe more sensitive than infra-red spectroscopy to the local environment. We exploit this property to effectively probe hydrogen bond strength via the distribution of intramolecular OH potentials derived from measurements. In contrast, the dynamical splitting in the spectral feature of the lowest valence-excited state arises from the short-range part of the OH potential curve and is rather insensitive to hydrogen bonding.

Date: 2019
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DOI: 10.1038/s41467-019-08979-4

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