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12344329771
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2 molecule in a superoxo-like configuration (16, 17) and that negatively charged free gold clusters are catalytically active for the CO-combustion reaction (15), whereas positively charged clusters are inert for the reaction, because oxygen cannot be adsorbed (11).
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19
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28
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12344260949
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note
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8 clusters with the molecule adsorbed on the top facet of the cluster (4)].
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29
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12344279352
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note
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The consequent depletion of the 5σ frontier orbital is often referred to in surface science studies as (forward) donation from CO to the metal (30, 31).
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33
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12344297866
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note
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The binding energy of the molecule to the gold cluster is the result of several factors that manifest themselves simultaneously (the aforementioned hybridizations of the CO 5σ and 1π orbitals with the s-d wavefunctions of the gold cluster, in addition to the contribution to the binding associated with population of the 2π* orbital). Consequently, although the C-O bond length and the CO vibrational frequency are sensitive to and correlate with the degree of back-donation into the hybridized antibonding 2π* orbital, the adsorption energy of CO to the gold cluster may not exhibit such correlation (for example, results in Table 2).
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34
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12344302478
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note
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U.L., B.Y., and H.H. acknowledge support by the U.S. Air Force Office of Scientific Research and the U.S. Department of Energy (DOE). The computer simulations were performed on U.S. Department of Defense computers supported by the High Performance Computing Modernization Program and at DOE's National Energy Research Scientific Computing Center at the Lawrence Berkeley National Laboratory. The experiments were carried out at the University of Ulm. Support for the experiments was also obtained from the Deutsche Forschungsgemeinschaft, the Sonderforschungsbereich 569, and the Landesstiftung Baden-Württemberg. K.J. thanks the Alexander v. Humboldt foundation and the Japan Society for the Promotion of Science foundation for financial support, J.-M.A. thanks the Swiss National Science foundation, and S.A. thanks the Alexander v. Humboldt foundation for financial support. A.S.W. acknowledges support from the Graduiertenkolleg Molekulare Organisation und Dynamik an Grenz- und Oberflächen.
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