Site- and Energy-Selective Low-Energy Electron Emission by X-rays in the Aqueous Phase
Low-energy-electron emission from resonant Auger final states via intermolecular Coulombic decay (RA-ICD) has previously been described as a promising scenario for controlling radiation damage for medical purposes, but it has so far only been observed in prototypical atomic and molecular van der Waals dimers and clusters. Here, we report the experimental observation of RA-ICD in an aqueous solution. We show that for solvated Ca<sup>2+</sup> ions, the emission can be very efficiently controlled by tuning the photon energy of exciting X-rays to inner-shell resonances of the ions. Our results provide the next step from demonstrating RA-ICD in relatively simple prototype systems to understanding the relevance and potential applications of ICD in real-life scenarios.
Authors
- I. Unger (ORCID: https://orcid.org/0000-0003-1001-4134)
- Tillmann Buttersack (ORCID: https://orcid.org/0000-0002-4547-2656)
- Arno Ehresmann (ORCID: https://orcid.org/0000-0002-0981-2289)
- U. Hergenhahn (ORCID: https://orcid.org/0000-0003-3396-4511)
- Rémi Dupuy (ORCID: https://orcid.org/0000-0002-8372-2142)
- Noelle Walsh (ORCID: https://orcid.org/0000-0003-0580-4203)
- Clemens Richter (ORCID: https://orcid.org/0000-0003-1807-1643)
- Gabriel Klassen
- Lorenz S. Cederbaum (ORCID: https://orcid.org/0000-0002-4598-0650)
- Yusaku Terao
- Florian Trinter (ORCID: https://orcid.org/0000-0002-0891-9180)
- Johannes H. Viehmann
- Dana Bloß (ORCID: https://orcid.org/0009-0006-6291-0837)
- Andreas Hans (ORCID: https://orcid.org/0000-0002-4176-4766)
- Olle Björneholm (ORCID: https://orcid.org/0000-0002-7307-5404)
- G. Öhrwall (ORCID: https://orcid.org/0000-0002-5795-8047)
- Niklas Golchert
- Lasse Wülfing
- Adrian Krone (ORCID: https://orcid.org/0009-0005-3652-2585)
Institutions
- University of Kassel (DE)
- Uppsala University (SE)
- Lund University (SE)
- TU Dortmund University (DE)
- Heidelberg University (DE)
- Fritz Haber Institute of the Max Planck Society (DE)
- Sorbonne Université (FR)
- MAX IV Laboratory (SE)
- Laboratoire de Chimie Physique - Matière et Rayonnement (FR)
- Laboratoire Médiations (FR)
Publication Details
- Journal
- Journal of the American Chemical Society
- Published
- 2025-06-13
- DOI
- https://doi.org/10.1021/jacs.5c06436
- Citations
- 1
- Primary Topic
- Electron and X-Ray Spectroscopy Techniques
- Type
- article
- Field-Weighted Citation Impact
- 0.66
Funders
- Deutsche Forschungsgemeinschaft
- VINNOVA
- Svenska Forskningsrådet Formas
- Bundesministerium für Bildung und Forschung
- Max-Planck-Gesellschaft
- Vetenskapsrådet
- H2020 European Research Council