Abstract
A flow system was set up to measure the quenching probability γ of O2(1Δg) on various O2-adsorbed metal surfaces including Cu, Cr, Ni, and Ag. γ increased with both the duration of the experiment and the O2(1Δg) concentration. After several hours evacuation to a few Pa, γ can return to its original value. A deactivation mechanism of O2(1Δg) is suggested by considering first the weak chemisorption of O2(1Δg) on the surface adsorption sites, followed by the near resonant energy transfer between the gas phase O2(1Δg) and surface O2(3Σ−g). A phenomenological model in accord with the experimental fact has been proposed together with relevant kinetic equations.
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