University of Oulu

Tian, L., Ding, B., Nicolas, C., Wu, R., Feng, Y., Patanen, M., Nandi, S., Bozek, J., Miron, C., & Liu, X.-J. (2021). Selective dissociation of the spectator Auger final states in O2 molecules. Physical Review A, 103(4): 043103.

Selective dissociation of the spectator Auger final states in O₂ molecules

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Author: Tian, Lifang1; Ding, Bocheng1; Nicolas, Christophe2;
Organizations: 1School Physical Science and Technology, ShanghaiTech University, Shanghai 201210, 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
4Université Paris-Saclay, CEA, CNRS, LIDYL, 91191 Gif-sur-Yvette, France
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.2 MB)
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Language: English
Published: American Physical Society, 2021
Publish Date: 2021-05-06


Molecular cationic states with two valence holes and one n-Rydberg electron can be created after spectator Auger decay. Unraveling these states’ dissociation is often very challenging due to the frequent occurrence of conical intersections between cationic potential energy curves. Here, based on an advanced analysis of the experimental multicoincidence data obtained after O1s core excitation in O₂, we achieved an energy-resolution better than we recently exploited in Phys. Rev. A 99, 022511 (2019). We therefore revealed a group of weak channels in the two-dimensional energy-correlation map between the coincident resonant Auger electron and ion in addition to the previously reported strong ones. The fragments in the identified weak channels contain only outmost electrons in valence orbitals; in contrast, the fragments in the strong channels contain an outmost electron in a n'-Rydberg orbital. Compared with the strong channels, the weak channels preferentially occur at smaller principal quantum number n. It indicates that the electron orbital size tends to be conserved during the dissociation process. These weak features are suggested to be created by the Rydberg-valence mixing between the molecular spectator Auger final state and the very dissociative molecular cationic states without the Rydberg electron. A tendency to orbital selection is also suggested in the Rydberg-valence mixing.

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Series: Physical review. A
ISSN: 2469-9926
ISSN-E: 2469-9934
ISSN-L: 2469-9926
Volume: 103
Issue: 4
Article number: 043103
DOI: 10.1103/PhysRevA.103.043103
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: X.-J.L. gratefully acknowledges financial support by the National Natural Science Foundation of China (Grant No. 11574020) and Project of Thousand Youth Talents in China.
Copyright information: © 2021 American Physical Society.