Abstract

Innocence lost: The IR spectra of Au/CO complexes adsorbed on of a MgO(001) film differ from the corresponding neutral Au clusters. Calculations indicate this shift of 200–250 cm−1 can be associated with a negative charge on the Au/CO complex. For Au/CO complexes on so-called color centers a charge transfer is expected, however Au atoms on terrace sites are neutral. Thus, CO in fact induces the charge transfer instead of reporting the charge state of the adsorbed Au atoms.

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