Monochromatic UV light in the spectral interval between 4.0 and 5.5 eV is used in order to selectively excite 3- and 4-coordinated oxygen anion sites on the surface of MgO nanoparticles exposed to gas. As a result, two different paramagnetic surface species and also ozonide anions are observed by electron paramagnetic resonance (EPR) spectroscopy. The relative abundance of each of the species exhibits a specific dependence on the energy of the exciting photons. EPR data together with the results of theoretical modeling suggest that both species are located at 3-coordinated sites having different local environments. At sufficiently high pressures molecular oxygen does not only act as an electron trap, favoring the formation, but it also contributes to UV induced formation with a maximum efficiency at 4.2 eV.
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22 January 2002
Research Article|
January 22 2002
Wavelength selective excitation of surface oxygen anions on highly dispersed MgO
Oliver Diwald;
Oliver Diwald
Institut für Physikalische und Theoretische Chemie, Technische Universität Wien, c/o Veterinärplatz 1 / GA, A-1210, Wien, Austria
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Martin Sterrer;
Martin Sterrer
Institut für Physikalische und Theoretische Chemie, Technische Universität Wien, c/o Veterinärplatz 1 / GA, A-1210, Wien, Austria
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Erich Knözinger;
Erich Knözinger
Institut für Physikalische und Theoretische Chemie, Technische Universität Wien, c/o Veterinärplatz 1 / GA, A-1210, Wien, Austria
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Peter V. Sushko;
Peter V. Sushko
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6 BT, United Kingdom
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Alexander L. Shluger
Alexander L. Shluger
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6 BT, United Kingdom
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J. Chem. Phys. 116, 1707–1712 (2002)
Article history
Received:
July 31 2001
Accepted:
November 01 2001
Citation
Oliver Diwald, Martin Sterrer, Erich Knözinger, Peter V. Sushko, Alexander L. Shluger; Wavelength selective excitation of surface oxygen anions on highly dispersed MgO. J. Chem. Phys. 22 January 2002; 116 (4): 1707–1712. https://doi.org/10.1063/1.1429923
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