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Chemisorption of Nitrogen Monoxide on Size‐Selected Cobalt Cluster Ions
Author(s) -
Hanmura Tetsu,
Ichihashi Masahiko,
Kondow Tamotsu
Publication year - 2007
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1560/ijc.47.1.37
Subject(s) - chemisorption , chemistry , carbon monoxide , ion , internal energy , branching (polymer chemistry) , atomic physics , analytical chemistry (journal) , thermodynamics , catalysis , adsorption , organic chemistry , physics
Collisional reactions of NO with Co n + ( n = 2–10) were studied by measuring the absolute cross sections for creating the product ions in a beam‐gas geometry at different collision energies and internal temperatures of Co n + . The dominant reaction is chemisorption of NO on Co n + (formation of Co n NO + and Co n –1 NO + ). As n increases, the chemisorption cross section starts to rise sharply at n = 4 and soon reaches the highest possible value, which is the Langevin cross section. The chemisorption cross section practically does not change with the internal temperature, while the branching fraction for the production of Co n NO + with respect to the sum of Co n NO + and Co n –1 NO + decreases with the internal temperature in the size range of n = 6–10. A statistical model based on the RRK theory explains the dependences of the chemisorption cross section and the branching fraction on the size ( n ), the collision energy, and the internal temperature. The energies of the NO chemisorption derived from the dependences of the chemisorption cross section and the branching fraction on the collision energy and the internal temperature show that (1) the NO chemisorption is dissociative for n ≥ 4 and (2) more than one isomer is involved in the chemisorption of NO on Co 9 + .