Scanning Tunneling Microscopy was used to study the adsorption of oxygen on the PdAg(111) surface. Oxygen atoms appear as dark holes of about 40 pm depth, whereas palladium atoms appear as bright spots. By comparing consecutive STM images, oxygen was found to occupy only palladium sites: the oxygen was found to travel exclusively to and from the palladium atoms. The surface concentration of oxygen was low under all the experimental conditions used, as indicated by STM as well as Auger electron spectroscopy.
Corresponding author: M. Schmid (schmid).
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