Abstract
The sorption of oxygen on a polycrystalline platinum ribbon has been studied with the aid of a quadrupole mass analyzer in an ultrahigh vacuum system in the pressure range from 5 to 10 × 10 −8 Torr. An evaluation of the reaction coefficient and the total mass of oxygen sorbed indicated that oxygen competes with carbon monoxide, present as a background contaminant ( P ∼- × 10 −9 Torr), for the sorption sites on the flash-cleaned platinum surface. Subsequent desorption of oxygen is not observed when the platinum is flash heated to temperatures up to 1100 °K; carbon monoxide and carbon dioxide are predominant species leaving the platinum surface. The relative amount of each component depends on the length of exposure of the flash-cleaned platinum ribbon to the background gas and to oxygen. The experimental results suggest a high reaction coefficient of oxygen on a clean platinum surface at room temperature ( S ∼- 0.2).
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