New insight into the Auger decay process in O2: The coincidence perspective

Tiberiu Arion, Ralph Püttner, Cosmin Lupulescu, Ruslan Ovsyannikov, Marko Förstel, Gunnar Öhrwall, Andreas Lindblad, Kiyoshi Ueda, Svante Svensson, Alex M. Bradshaw, Wolfgang Eberhardt, Uwe Hergenhahn

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Photoelectron-Auger electron coincidence spectroscopy is a powerful tool for the investigation of Auger decay processes with different core-ionized intermediate states. In this paper we describe an investigation into the Auger decay of the O2 molecule, with the purpose of bringing new insight into the dynamics of the core hole decay mechanism. Using a novel experimental approach to measuring such coincidence spectra we report the highest resolution Auger spectrum of O2 recorded hitherto. In our approach, we have combined the advantages of these coincidence spectra with the high resolution and excellent signal-to-noise ratios of non-coincident Auger spectra and a state-of-the-art fit analysis. In this way we have derived information about the potential energy curves of the final states W 3Δu, B 3Πg, and B′ 3Σ u - and concluded that the corresponding Auger transitions are formed to a large part by strongly overlapping vibrational progressions. The present findings are compared to earlier results reported in the literature confirming some theoretical predictions.

Original languageEnglish
Pages (from-to)234-243
Number of pages10
JournalJournal of Electron Spectroscopy and Related Phenomena
Issue number8-9
Publication statusPublished - 2012 Sep


  • Auger decay
  • Franck-Condon analysis
  • High resolution coincidence spectroscopy
  • Oxygen

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry


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