D L Hansen et al 2002 J. Phys. B: At. Mol. Opt. Phys. 35 L381 doi:10.1088/0953-4075/35/17/101
Anion formation moderated by post-collision interaction following core-level photoexcitation of CO
FREE ARTICLED L Hansen1, W C Stolte2, O Hemmers2, R Guillemin2 and D W Lindle2
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The photon-energy dependence of the oxygen-anion (O−) yield has been measured following photoexcitation of CO just above both the C and O K-shell ionization thresholds. The observed exponentially decaying yields above both edges are attributed to a post-collision interaction (PCI) between the emitted photoelectron and the CO molecule. Using a modified semi-classical atomic model, the near-threshold spectra can be reproduced if an energy shift is included. The shift in photon energy above the C K edge is greater than above the O K edge. The difference is attributed to a site-dependent PCI effect related to the polarity of the valence orbitals of the CO molecule.
- PACS
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33.80.Eh Autoionization, photoionization, and photodetachment
- Subjects
- Dates
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Issue 17 (14 September 2002)
Received 8 May 2002, in final form 16 July 2002
Published 20 August 2002
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Anion formation moderated by post-collision interaction following core-level photoexcitation of CO
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