title: Oxidation of CO and NO on composition-selected cerium oxide cluster cations.
abstract: The collisional reactions of composition-selected cerium oxide cluster cations, CenOm(+) (n = 2-6; m ≤ 2n), with CO and NO have been investigated under single collision conditions using a tandem mass spectrometer. At near-thermal energy, oxidation of CO and NO is observed only for the stoichiometric clusters, CenO2n(+) (n = 3-5), and the cross sections for the NO oxidation are found to be larger than those for the CO oxidation. In addition, the collision-energy dependence of the reaction cross sections reveals that the CO oxidation has a small activation barrier, whereas the NO oxidation is a barrierless process. These experimental findings are supported by density functional theory calculations.
authors.affiliation: East Tokyo Laboratory, Genesis Research Institute, Inc. , 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan.
authors.forename: Shinichi
authors.initials: S
authors.lastname: Hirabayashi
authors.forename: Masahiko
authors.initials: M
authors.lastname: Ichihashi
mesh_terms: D002248:Carbon Monoxide / Q000737:chemistry*; D002412:Cations; D002563:Cerium / Q000737:chemistry*; D009569:Nitric Oxide / Q000737:chemistry*; D010084:Oxidation-Reduction
chemical_list: D002412:Cations; D002563:Cerium; D009569:Nitric Oxide; C030583:ceric oxide; D002248:Carbon Monoxide