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New insight into the Auger decay process in O-2: The coincidence perspective

Författare:
  • Tiberiu Arion
  • Ralph Puettner
  • Cosmin Lupulescu
  • Ruslan Ovsyannikov
  • Marko Foerstel
  • Gunnar Öhrwall
  • Andreas Lindblad
  • Kiyoshi Ueda
  • Svante Svensson
  • Alex M. Bradshaw
  • Wolfgang Eberhardt
  • Uwe Hergenhahn
Publiceringsår: 2012
Språk: Engelska
Sidor: 234-243
Publikation/Tidskrift/Serie: Journal of Electron Spectroscopy and Related Phenomena
Volym: 185
Nummer: 8-9
Dokumenttyp: Artikel
Förlag: Elsevier

Sammanfattning

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 O-2 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 O-2 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-3 Delta(u), B-3 Pi(g), and B' (3)Sigma(-)(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. (C) 2012 Elsevier B.V. All rights reserved.

Disputation

Nyckelord

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

Övrigt

Published
Yes
  • ISSN: 0368-2048

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