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

Summary, in English

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.

• Author: 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
• Department/s: MAX IV Laboratory
• Publishing year: 2012
• Language: English
• Pages: 234-243
• Publication/Series: Journal of Electron Spectroscopy and Related Phenomena
• Volume: 185
• Issue: 8-9
• Links: http://dx.doi.org/10.1016/j.elspec.2012.06.010
• Document type: Journal article
• Publisher: Elsevier
• Topic: Natural Sciences; Physical Sciences
• Keywords: High resolution coincidence spectroscopy; Auger decay; Oxygen; Franck-Condon analysis
• Status: Published
• ISBN/ISSN/Other: ISSN: 0368-2048