University of Oulu

Pelimanni, E., Hans, A., Heikura, E., Huttula, M., & Patanen, M. (2022). Efficient neutralization of core ionized species in an aqueous environment. Physical Chemistry Chemical Physics, 24(19), 11646–11653.

Efficient neutralization of core ionized species in an aqueous environment

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Author: Pelimanni, Eetu1; Hans, Andreas1,2; Heikura, Emilia1,2;
Organizations: 1Nano and Molecular Systems Research Unit, Faculty of Science, University of Oulu, Box 3000, FI-90014, Finland
2Universität Kassel, Institut für Physik und CINSaT, Heinrich-Plett-Straße 40, Kassel, Germany
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.8 MB)
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Language: English
Published: Royal Society of Chemistry, 2022
Publish Date: 2022-06-08


Core ionization dynamics of argon–water heteroclusters ArM[H₂O]N are investigated using a site and process selective experimental scheme combining 3 keV electron irradiation with Auger electron–ion–ion multi-coincidence detection. The formation of Ar 2p⁻¹ vacancies followed by non-radiative decay to intermediate one-site doubly ionized states Ar²⁺(3p⁻²)−ArM−1[H₂O]N and subsequent redistribution of charge to the cluster environment are monitored. At low argon concentrations the emission of an [H₂O]n′H⁺/[H₂O]n′′H⁺ ion pair is the dominant outcome, implying on high efficiency of charge transfer to the water network. Increasing the condensation fraction of argon in the mixed clusters and/or to pure argon clusters is reflected as a growing yield of Arm′+/Arm′′+ ion pairs, providing a fingerprint of the precursor heterocluster beam composition. The coincident Auger electron spectra, resolved with better than 1 eV resolution, show only subtle differences and thereby reflect the local nature of the initial Auger decay step. The results lead to better understanding of inner shell ionization processes in heterogeneous clusters and in aqueous environments in general.

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Series: PCCP. Physical chemistry chemical physics
ISSN: 1463-9076
ISSN-E: 1463-9084
ISSN-L: 1463-9076
Volume: 24
Pages: 11646 - 11653
DOI: 10.1039/d2cp01178f
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: The authors gratefully acknowledge financial support by the Academy of Finland, the Finnish Cultural Foundation (North Ostrobothnia Regional fund) and the Tauno Tönning Foundation.
Copyright information: This journal is © the Owner Societies 2022. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.