Abstract
Exposure to oxygen of a high defect density Co(0001) surface at or above room temperature but below ∼700°C shows an initial temperature independent chemisorption phase followed by temperature dependent absorption of oxygen into the bulk. CoO is formed at the surface only below about 150°C since the oxygen concentration required for CoO formation is not achieved at the surface below that temperature under current exposure conditions due to the rapid diffusion of oxygen into the bulk cobalt. Exposure above ∼700°C results in no distinct chemisorbed phase and direct diffusion of oxygen into the bulk.
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