University of Oulu

Song, S., Ding, B., Xu, W., Nicolas, C., Patanen, M., Nandi, S., Bozek, J., Miron, C., Xiao, Z., Liu, X. (2019) Sequential electron emission and nuclear dissociation after the O 1s→(Σu−4)4pσ excitation in O2 molecules. Physical Review A, 99 (2), 022511.

Sequential electron emission and nuclear dissociation after the O \(1s→({}^4\Sigma^{−}_{u})4pσ\) excitation in O₂ molecules

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Author: Song, Shan1,2; Ding, Bocheng2; Xu, Weiqing2;
Organizations: 1School of Physics and Nuclear Energy Engineer, Beihang University, Xueyuan Road, Beijing 100191, China
2School Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
3Synchrotron SOLEIL, l’Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
4Nano and Molecular Systems Research Unit, Molecular Materials Research Community, Faculty of Science, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland
5LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France
6Extreme 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, 1.1 MB)
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Language: English
Published: American Physical Society, 2019
Publish Date: 2019-03-21


When an electron is resonantly excited from a core orbital to a Rydberg one in a molecule, complex multi-time-scale multistep processes are triggered. By using a high-resolution energy-resolved coincidence between Auger electron and ions, we identified the sequences of processes following the spectator Auger decays induced by K-shell excitation in O₂. The first step of the spectator Auger decay can end up to a few metastable O₂⁺ states which autoionize into stable O₂²⁺. However, the majority of O₂⁺ states are dissociative. They evolve into several dissociation limits with complex crossings between potential-energy curves. After the molecular dissociation is finished, the generated fragments can further decay either by fluorescence emission or by autoionization. Interestingly, some electrons are always emitted after molecular dissociation.

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Series: Physical review. A
ISSN: 2469-9926
ISSN-E: 2469-9934
ISSN-L: 2469-9926
Volume: 99
Issue: 2
Article number: 022511
DOI: 10.1103/PhysRevA.99.022511
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 (Grant No. 11574020) and Project of Thousand Youth Talents in China. The experiment was performed at the PLEIADES beamline at the SOLEIL Synchrotron, France (Proposal No. 20140796). We are grateful to E. Robert for technical assistance and to the SOLEIL staff for stable operation of the equipment and of the storage ring during the experiments. Prof. K. Ueda is warmly greatly acknowledged for helpful discussions.
Copyright information: ©2019 American Physical Society.