Oxygen species adsorbed on oxides. Part 2.—Formation of (O–3)s on MgO
- 1 January 1972
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 68, 1181-1189
- https://doi.org/10.1039/f19726801181
Abstract
A MgO surface containing adsorbed (O–)+ s ions reacts with excess oxygen to form the molecular ion (O– 3)s. This ion has been characterized by e.s.r. using oxygen enriched with 17O and shows a complex hyperfine structure. Heating at 400 K converts the (O– 3)s ions to (O– 2)s and an isotopic exchange occurs between the various oxygen nuclei. The optical data indicate that a band close to 420 nm is associated with the (O– 3)s species. Calculations using electron affinity and bond energy data indicate that the reaction O–+ O2→ O– 3 is exothermic and that (O– 3)s must be considered as a possible adsorbed oxygen species on oxides.Keywords
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