Postcollision-interaction effects in multistep Auger transitions following Ar $1s$ photoionization

Postcollision-interaction effects in multistep Auger transitions following Ar $1 s$ photoionization

S. Kosugi, R. Guillemin, O. Travnikova, T. Marchenko, D. Koulentianos, J. B. Martins, F. Hosseini, R. Püttner, D. Céolin, L. Journel, M. N. Piancastelli, I. Ismail, F. Koike, M. Iizawa, S. Sheinerman, L. Gerchikov, Y. Azuma, and M. Simon

Phys. Rev. A 106, 033114 – Published 23 September 2022

Abstract

Postcollision-interaction (PCI) effects involving multistep decay processes following Ar $1 s$ photoionization has been studied by Auger electron spectroscopy. The experiment focused on $L M M$ Auger electrons measured in small photon energy steps across the Ar $1 s$ photoionization threshold. Decay pathways that we studied include (1) the ${Ar}^{+ *} 2 p^{- 1} \to {Ar}^{2 +} 3 p^{- 2}$ LMMα Auger process due to a single $L$ hole created by $K L$ fluorescence, (2) the ${Ar}^{2 + *} 2 p^{- 2} \to {Ar}^{3 + *} 2 p^{- 1} 3 p^{- 2}$ ${L M M}_{1}$ Auger process following double $L$ shell hole states produced by a $K L L$ Auger processes, and (3) the subsequent ${Ar}^{3 + *} 2 p^{- 1} 3 p^{- 2} \to {Ar}^{4 +} 3 p^{- 4}$ ${L M M}_{2}$ Auger transitions. Particularly pronounced PCI shifts and unusual line shapes compared to the ordinary one-step PCI process were found in the spectra of Auger processes following a $K L L$ Auger first step. The experimental results were compared with calculations based on the semiclassical approach to PCI. Good agreement was found between the calculated and experimental PCI shifts. The result opens possibilities for further studies of the multielectron dynamics between Auger electrons mediated through the photoelectron in these and similar systems.

Received 10 March 2022
Accepted 18 August 2022

DOI:https://doi.org/10.1103/PhysRevA.106.033114

Physics Subject Headings (PhySH)

Atomic & molecular structure Autoionization & Auger processes Electronic structure of atoms & molecules Single- and few-photon ionization & excitation X-ray beams & optics

Atomic, Molecular & Optical

Authors & Affiliations

S. Kosugi^1,2, R. Guillemin³, O. Travnikova ^3,4, T. Marchenko ^3,4, D. Koulentianos ^3,*, J. B. Martins ^3,†, F. Hosseini³, R. Püttner ⁵, D. Céolin⁴, L. Journel ^3,4, M. N. Piancastelli ^3,6, I. Ismail^3,4, F. Koike¹, M. Iizawa ⁷, S. Sheinerman ⁸, L. Gerchikov ⁹, Y. Azuma ^1,10,‡, and M. Simon ^3,4

¹Department of Materials and Life Sciences, Sophia University, Tokyo 102-8554, Japan
²Department of Physics, Tokyo Gakugei University, Tokyo 184-8501, Japan
³Sorbonne Université, CNRS, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, F-75005 Paris, France
⁴Synchrotron SOLEIL, l’Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette Cedex, France
⁵Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
⁶Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden
⁷Department of Physics, Rikkyo University, Tokyo 171-8501, Japan
⁸Department of Physics, St. Petersburg State Marine Technical University, 190121 St. Petersburg, Russia
⁹Department of Physics, Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia
¹⁰Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India

^*Present address: Center for Free-Electron Laser Science & Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
^†Present address: X-ray Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.
^‡y-azuma@sophia.ac.jp

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Vol. 106, Iss. 3 — September 2022

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