A new model is proposed to explain the observed O emission from cesium‐coated surfaces on exposure to oxygen, whereby hyperthermal O resulting from thermal O2+Cs(s) collisions is the intermediate product leading to O formation. The velocity of O is estimated on the basis of the potential‐energy‐surface crossing model of Gadzuk and Holloway [J. Chem. Phys. 82, 5203 (1985)]. The mechanism of O formation is also discussed.

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