Distortion is the key: In situ EPR spectroscopy provides the first experimental confirmation that the adsorption of O2 molecules on a stoichiometric ultrathin MgO(001) film on Mo(001) leads to the spontaneous formation of O2.- radicals. The results show that polaronic distortion of the MgO lattice (see picture; Mg yellow, O blue) stabilizes the radical, and this distortion is only possible in very thin films. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Gonchar, A., Risse, T., Freund, H., Giordano, L., DI VALENTIN, C., Pacchioni, G. (2011). Activation of Oxygen on MgO: O-2(center dot-) Radical Ion Formation on Thin, Metal-Supported MgO(001) Films. ANGEWANDTE CHEMIE. INTERNATIONAL EDITION, 50, 2635-2638 [10.1002/anie.201005729].
Activation of Oxygen on MgO: O-2(center dot-) Radical Ion Formation on Thin, Metal-Supported MgO(001) Films
GIORDANO, LIVIA;DI VALENTIN, CRISTIANA;PACCHIONI, GIANFRANCO
2011
Abstract
Distortion is the key: In situ EPR spectroscopy provides the first experimental confirmation that the adsorption of O2 molecules on a stoichiometric ultrathin MgO(001) film on Mo(001) leads to the spontaneous formation of O2.- radicals. The results show that polaronic distortion of the MgO lattice (see picture; Mg yellow, O blue) stabilizes the radical, and this distortion is only possible in very thin films. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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