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Activation of Oxygen on MgO: O 2 .− Radical Ion Formation on Thin, Metal‐Supported MgO(001) Films
Author(s) -
Gonchar Anastasia,
Risse Thomas,
Freund HansJoachim,
Giordano Livia,
Di Valentin Cristiana,
Pacchioni Gianfranco
Publication year - 2011
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201005729
Subject(s) - radical , electron paramagnetic resonance , oxygen , stoichiometry , thin film , materials science , distortion (music) , metal , molecule , ion , lattice (music) , photochemistry , adsorption , inorganic chemistry , analytical chemistry (journal) , chemistry , nuclear magnetic resonance , nanotechnology , optoelectronics , organic chemistry , metallurgy , amplifier , physics , cmos , acoustics
Distortion is the key : In situ EPR spectroscopy provides the first experimental confirmation that the adsorption of O 2 molecules on a stoichiometric ultrathin MgO(001) film on Mo(001) leads to the spontaneous formation of O 2 .− 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.