Abstract
A direct first step in the mechanism for the initial oxidation of a polycrystalline tungsten surface, the catalyzed dissociation of O2 on it, or the formation of WO X by O2 at intermediate temperatures is shown to occur in ∼10−13 s. Molecular beam experiments demonstrated that the reactivity was greater than 90%, the unreacted O2 was substantially unaccommodated in translational energy to the surface temperature, and the reaction probability was nearly independent of surface temperature from 2800 to 415 K although there was a small increase at 415 K. The general conditions when no molecular surface precursor state contributes to the surface reactivity are discussed.
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Auerbach, D., Becker, C., Cowin, J. et al. Mechanism and speed of initial step of oxygen chemisorption-O2 on W. Appl. Phys. 14, 411–413 (1977). https://doi.org/10.1007/BF00883448
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DOI: https://doi.org/10.1007/BF00883448