Abstract

The frequency shift in the stretching mode of peroxo-like O 2 on Ag(110) is studied by EELS. The anharmonicity parameter and an estimate of the dissociation energy are obtained from the frequency of the 0 → 2 vibrational transition. A comparison with already published data for free and physisorbed oxygen is given. We find that chemisorption strongly reduces the dissociation energy and that the anharmonicity is larger than in the case of physisorption.

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