Surface kinetics of N and O atoms in discharges

摘要: The probability, , of losses N and O atoms on Pyrex walls was determined from a fit calculated to measured concentrations [O] [NO] in low-pressure glow discharge for percentage . kinetic model used calculations includes detailed description the processes occurring bulk surface reactions atoms. It found that are functions ratio wall temperature, values were increase about as increases 1% 90% (corresponding ). probability be independent depend only range For however, depends its magnitude increasing by factor 2 - 5 developed here provides closed expressions terms rate constants activation energies these reactions. is shown behaviour well explained under following conditions: (i) main low temperatures involved reversible adsorption followed diffusion adatoms active sites, where they may either irreversibly adsorbed or recombine; (ii) there exist two systems with different reaction probabilities.