Abstract
Reactions in the layer of CH3 radicals adsorbed on the surfaces of polycrystalline molybdenum and copper were studied using the method of temperature-programmed reaction (TPR). After N2 and CH3 · adsorption (the products of azomethane pyrolysis) on molybdenum, N2, H2, and CH4 were observed in comparable amounts in the TPR spectrum. At the same time, only methane was detected in the TPR products on the copper surface. The spatial distributions of CH4 desorption flows were measured, which were indicative of translational excitation of these molecules. The direct measurements of the rates of the CH4 molecules desorbed from the copper surface showed that their translational energy was 10–15 times greater than the thermal one. The mechanisms of reactions on the Mo and Cu surfaces are proposed. The rate constants were calculated for some of the elementary steps.
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