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The oxidation of carbon monoxide with nitrous oxide on mass-selected and clusters has been investigated under multicollision conditions in an octopole ion trap experiment. The comparative study reveals that for both gold and silver cations carbon dioxide is formed on the clusters. However, whereas in the case of the cluster itself acts as reactive species that facilitates the formation of CO2 from N2O and CO, for silver the oxidizedclustersAg3O x + (n = 1–3) are identified as active in the CO oxidationreaction. Thus, in the case of the silvercluster cations N2O is dissociated and one oxygen atom is suggested to directly react with CO, whereas a second kind of oxygen strongly bound to silver is acting as a substrate for the reaction.


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