title: Reactions of nitrogen monoxide on cobalt cluster ions: reaction enhancement by introduction of hydrogen.
abstract: Absolute cross sections for NO chemisorption, NO decomposition, and cluster dissociation in the collision of a nitrogen monoxide molecule, NO, with cluster ions Con+ and ConH+ (n=2-5) were measured as a function of the cluster size, n, in a beam-gas geometry in a tandem mass spectrometer. Size dependency of the cross sections and the change of the cross sections by introduction of H to Con+ (effect of H-introduction) are explained by a statistical model based on the RRK theory, with the aid of the energetics obtained by a DFT calculation. It was found that the reactions are governed by the energetics rather than dynamics. For instance, Co3+ does not react appreciably with NO because the reactions are endothermic, while Co3H+ does because the reaction becomes exothermic by the H-introduction.
authors.affiliation: East Tokyo Laboratory, Genesis Research Institute, Inc., 717-86 Futamata, Ichikawa, Chiba 272-0001, Japan.
authors.forename: Tetsu
authors.initials: T
authors.lastname: Hanmura
authors.forename: Masahiko
authors.initials: M
authors.lastname: Ichihashi
authors.forename: Yoshihide
authors.initials: Y
authors.lastname: Watanabe
authors.forename: Noritake
authors.initials: N
authors.lastname: Isomura
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Kondow
mesh_terms: D002384:Catalysis; D002627:Chemistry, Physical / Q000379:methods; D003035:Cobalt / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D007477:Ions / Q000737:chemistry*; D007700:Kinetics; D013058:Mass Spectrometry; D008956:Models, Chemical; D008958:Models, Molecular; D015233:Models, Statistical; D009569:Nitric Oxide / Q000737:chemistry*
chemical_list: D007477:Ions; D009569:Nitric Oxide; D003035:Cobalt; D006859:Hydrogen