Core-level interatomic Coulombic decay in van der Waals clusters
Hans, Andreas; Küstner-Wetekam, Catmarna; Schmidt, Philipp; Ozga, Christian; Holzapfel, Xaver; Otto, Huda; Zindel, Christina; Richter, Clemens; Cederbaum, Lorenz S.; Ehresmann, Arno; Hergenhahn, Uwe; Kryzhevoi, Nikolai V.; Knie, André (2020-01-21)
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
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.
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https://urn.fi/URN:NBN:fi-fe202103107030
Tiivistelmä
Abstract
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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