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Molecular oxygen states present at Ag(111) surfaces when dioxygen is coadsorbed with ammonia at 80 K are characterised by vibrational loss features at 1488 and 1640 cm–1. The former is suggested to be associated with the NH3···O2δ– complex, a key intermediate in the oxidation pathway.
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Carley et al. (1998) studied this question.
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