University of Oulu

Liu, X., Nicolas, C., Patanen, M., Miron, C. (2017) Disentangling Auger decays in O2 by photoelectron-ion coincidences. Scientific Reports, 7: 2898. doi:10.1038/s41598-017-02875-x

Disentangling Auger decays in O₂ by photoelectron-ion coincidences

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Author: Liu, Xiao-Jing1,2; Nicolas, Christophe2; Patanen, Minna2,3;
Organizations: 1School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191, China
2Synchrotron SOLEIL, l’Orme des Merisiers, Saint-Aubin, BP 48, 91192, Gif-sur-Yvette Cedex, France
3Nano and Molecular Systems Research Unit, Molecular Materials Research Community, Faculty of Science, University of Oulu, P.O. Box 3000, 90014, Oulu, Finland
4Extreme Light Infrastructure Nuclear Physics (ELI-NP), “Horia Hulubei” National Institute for Physics and Nuclear Engineering, 30 Reactorului Street, RO-077125, Măgurele, Jud. Ilfov, Romania
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.2 MB)
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Language: English
Published: Springer Nature, 2017
Publish Date: 2018-04-03


In non-resonant Auger electron spectroscopies, multi core-ionized states lead to numerous energetically close-lying electronic transitions in Auger spectra, this hampering the assignment and interpretation of the experimental results. Here we reveal a new method to overcome this intrinsic limitation of non-resonant inner-shell spectroscopies. In a proof-of-principle experiment performed for the O₂ molecule, most of the Auger final states are dissociative, and we measure in coincidence the kinetic energy of the photoelectron and the kinetic energy release of the (O⁺, O⁺) ion pairs produced after the Auger decay of the O 1s−1 core-ionized states. The Auger final states are assigned using energy conservation. We fully separate the contributions from the ⁴Σ and ²Σ intermediate ionic states and conclusively demonstrate that the Auger decay probability can dramatically depend on the different O₂ 1s−1 intermediate multiplet states. In addition, a metastable Auger final state also exists, with lifetime longer than 3.8 μs, and clear changes are observed in both branching ratio and spectral profile of the O 1s photoelectron spectrum when they are recorded in coincidence with either O₂⁺⁺ or with other ionic species. These changes are attributed to the population of the metastable B′³Σu(ν′′=0) Auger final state via different intermediate states.

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Series: Scientific reports
ISSN: 2045-2322
ISSN-E: 2045-2322
ISSN-L: 2045-2322
Volume: 7
Article number: 2898
DOI: 10.1038/s41598-017-02875-x
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: X.L. gratefully acknowledges the financial support by the National Natural Science Foundation of China (11574020) and Project of Thousand Youth Talents in China.
Copyright information: © The Author(s) 2017. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit