Abstract
Dynamic secondary ion mass spectrometry (DSIMS) investigations have been carried out with Cr, Mn, Fe, Co, Mo, Rh, W, Re, Os and Ir under 4 mPa N2O, NO and 3 mPa NO2 as reactant gases. Results indicate similar behaviour in adsorption for Cr, Mn, Fe, Mo, W on the one hand and for Co, Rh, Os and Ir on the other. For the first group of metals the nitrogen oxide molecules are always totally destroyed in adsorption whereas the second group shows evidence for surface compounds such as MeNO (Me=metal) indicating only a partial dissociation in the case of N2O and NO2, and molecular adsorption under NO respectively. Re does not belong uniquely to either group because it reacts with N2O and NO2 dissociatively whereas under NO only partial dissociation is observed.
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