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Multielectron coincidence spectroscopy of the Ar2+(2p−2) double-core-hole decay

Maximilian Mailhiot1,7,*, Kari Jänkälä1, Marko Huttula1, Minna Patanen1, Klemen Bučar2, Matjaž Žitnik2, Denis Cubaynes3, Fabian Holzmeier4,†, Raimund Feifel5 et al.

Denis Céolin6, Lidija Andric7, Renaud Guillemin7, Iyas Ismail7, Jerome Palaudoux7, Francis Penent7, and Pascal Lablanquie7

  • 1Nano and Molecular Systems Research Unit (NANOMO), Faculty of Science, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
  • 2J. Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
  • 3Institut des Sciences Moléculaires d’Orsay, Centre National de la Recherche Scientifique, Bâtiment 520 Université Paris-Sud and Paris-Saclay, F-91405 Orsay Cedex, France
  • 4Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy
  • 5University of Gothenburg, Department of Physics, SE-41258 Gothenburg, Sweden
  • 6Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, F-91190 Saint-Aubin, France
  • 7Laboratoire de Chimie Physique Matière et Rayonnement, Sorbonne Université and Centre National de la Recherche Scientifique, F-75005 Paris, France

  • *Corresponding author: maximilian.mailhiot@oulu.fi
  • †Present address: Imec, Kapeldreef 75, BE-3001 Leuven, Belgium.
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Phys. Rev. A 107, 063108 – Published 23 June, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.063108

Abstract

The dominant decay pathways of argon 2p−2 double-core-hole states have been investigated using synchrotron radiation and a magnetic-bottle-type spectrometer coupled with an ion time-of-flight spectrometer. This experiment allows for efficient multi-electron-ion coincidence measurements, and thus for following the Auger cascade step by step in detail. Dominant decay pathways leading to Ar4+ final states via Ar3+ intermediate states have been assigned with the help of theoretical ab initio calculations. The weak correlated decay of the two core holes by emission of a single Auger electron, leading to Ar3+ final states, has been observed at 458.5-eV kinetic energy. Compared to the total decay of the 2p−2 double core vacancies, this two-electron–one-electron process was measured to have a branching ratio of 1.9×10−3±1.0×10−3. Furthermore, the remaining decay paths of the Ar1+(1s−1) core hole to higher charge states and their respective contributions to the total yield have been analyzed and show very good agreement with theoretical results.

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Phys. Rev. A 107, 063108– Published 23 June, 2023
  • Received 28 March 2023
  • Accepted 2 June 2023
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