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Activation of Oxygen on MgO: O2.− Radical Ion Formation on Thin, Metal-Supported MgO(001) Films

Authors

  • Anastasia Gonchar,

    1. Fritz Haber Institute of the Max Planck Society, Department of Chemical Physics, Faradayweg 4-6, 14195, Berlin (Germany), Fax: (+49) 30-8413-4316
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  • Prof. Dr. Thomas Risse,

    Corresponding author
    1. Fritz Haber Institute of the Max Planck Society, Department of Chemical Physics, Faradayweg 4-6, 14195, Berlin (Germany), Fax: (+49) 30-8413-4316
    2. Permanent address: Freie Universität Berlin, Institute of Chemistry and Biochemistry, Takustr.3, 14195 Berlin (Germany)
    • Fritz Haber Institute of the Max Planck Society, Department of Chemical Physics, Faradayweg 4-6, 14195, Berlin (Germany), Fax: (+49) 30-8413-4316
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  • Prof. Dr. Hans-Joachim Freund,

    1. Fritz Haber Institute of the Max Planck Society, Department of Chemical Physics, Faradayweg 4-6, 14195, Berlin (Germany), Fax: (+49) 30-8413-4316
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  • Dr. Livia Giordano,

    1. Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca via R. Cozzi, 53, I-20125 Milano (Italy)
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  • Dr. Cristiana Di Valentin,

    1. Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca via R. Cozzi, 53, I-20125 Milano (Italy)
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  • Prof. Dr. Gianfranco Pacchioni

    1. Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca via R. Cozzi, 53, I-20125 Milano (Italy)
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  • A.G. acknowledges support of the IMPRS “Complex surfaces in materials science”. We acknowledge support from the Deutsche Forschungsgemeinschaft through the CoE “Unifying concepts in catalysis” as well as the European Union through COST action D41. Support of the Fond der Chemischen Industrie is gratefully acknowledged. Part of the calculations have been performed on the BSC computing center (Barcelona, Spain).

Abstract

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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.

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