Ion-Induced CO Adsorption on Polycrystalline Nickel. Secondary Ion Mass Spectrometry Study
Reaction Kinetics and Catalysis Letters
, E-ISSN: 1588-2837
Federal Scientific Center, Boreskov Institute of Catalysis,
Novosibirsk, 630090, Russia
Russian Foundation for Basic Research
In the process of ion-induced CO adsorption (Ar+, 4 keV, 4 μA/cm2) on polycrystalline Ni at room temperature and P=(1−40)×10−6 Pa the emission of Ni+, NiCO+, CO+, NiO+ and C+ ions is observed. The emission of the last three ions is due to the ion-stimulated dissociation of weakly bound CO state and NiO formation. The weakly bound state is formed owing to surface defects produced by ion bombardment. The cross sections of the ion-induced desorption are 1.8 and 0.8×10−14 cm2, respectively, for weakly bound and strongly bound states.