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Anion and cation formation following core-level photoexcitation of CO2

G Öhrwall1,3, M M Sant'Anna2,4, W C Stolte1,2, I Dominguez-Lopez2,5, L T N Dang1, A S Schlachter2 and D W Lindle1

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Mass-resolved anion and cation partial-yield spectra following photoexcitation of CO2 have been recorded in the vicinity of the C 1s and O 1s thresholds. Anion production was found to be site specific: a weak production of O was observed on the π* resonance near the C K edge, whereas both C and O fragments were observed near the O K edge. Due to suppression of the shape resonances that dominate the cross section above the core thresholds, the anion-partial-yield spectra at the O K edge reveal several previously unobserved electronic states. In addition, several cations such as CO2+ and O2+ were observed for the first time.


PACS

33.80.Rv Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states)

33.15.Ta Mass spectra

33.70.Jg Line and band widths, shapes, and shifts

Subjects

Atomic and molecular physics

Dates

Issue 21 (14 November 2002)

Received 12 August 2002

Published 29 October 2002



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