University of Oulu

Hans, A., Küstner-Wetekam, C., Schmidt, P., Ozga, C., Holzapfel, X., Otto, H., Zindel, C., Richter, C., Cederbaum, L., Ehresmann, A., Hergenhahn, U., Kryzhevoi, N., Knie, A. (2020) Core-level interatomic Coulombic decay in van der Waals clusters. Physical Review Research, 2 (1), 012022. doi:10.1103/PhysRevResearch.2.012022

Core-level interatomic Coulombic decay in van der Waals clusters

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Author: Hans, Andreas1,2; Küstner-Wetekam, Catmarna1; Schmidt, Philipp1;
Organizations: 1Universität Kassel, Institut für Physik und CINSaT, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
2Nano and Molecular Systems Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland
3Leibniz-Institut für Oberflächenmodifizierung (IOM), Permoserstraße 15, 04318 Leipzig, Germany
4Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany
5Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.4 MB)
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Language: English
Published: American Physical Society, 2020
Publish Date: 2021-03-10


We report on the experimental observation of the direct decay of a core vacancy in van der Waals clusters by emission of a fast electron from a neighboring atom. The process can be regarded as an interatomic Coulombic decay of core holes (core-level ICD). We identify it unambiguously by electron-electron and electron-electron-photon coincidence spectroscopy of the decay of 2p vacancies in Ar clusters. While several earlier works reported the absence of this channel, we find core-level ICD to be of considerable significance and quantify the branching ratio of this nonlocal electron emission to conventional local Auger decay as (0.8±0.2)%. Our results are supported by calculations on smaller clusters and show a reasonable agreement. This report on a successfully performed electron-electron-photon coincidence experiment provides a perspective for explorations of matter exposed to ionizing radiation. The observed core-level ICD is proposed to be of general importance for studies on charge redistribution after core-level photoionization where van der Waals clusters are often used as prototype systems.

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Series: Physical review research
ISSN: 2643-1564
ISSN-E: 2643-1564
ISSN-L: 2643-1564
Volume: 2
Issue: 1
Article number: 012022
DOI: 10.1103/PhysRevResearch.2.012022
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: This work was funded by the Deutsche Forschungsgemeinschaft (DFG) (Project No. 328961117-SFB 1319 ELCH and Research Unit FOR 1789). L.S.C. is grateful to the European Research Council (Advanced Investigator Grant No. 692657) for financial support.
Copyright information: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.