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Dissociative chemisorption of O2 on Cu(100), S/Cu(100) and Ag/Cu(100) surface alloy has been investigated by Auger electron spectroscopy (AES). A strong reduction in the initial O2 chemisorption probability (S0) from 0.05 to 7.4×10−3 is observed already at an Ag coverage of 0.02 ML. Further Ag deposition results only in a moderate decrease in S0. Similar inhibition of O2 dissociation is observed on...
We report the formation of a (2×2) sulfur adlayer by the adsorption of H 2 S on Ni 3 Al(111) at room temperature, followed by annealing to ∼1100K. From Auger electron spectroscopy (AES) measurements, this pattern is consistent with a sulfur coverage (θ S ) of ≤0.25 monolayers (ML). A diffuse low-energy electron diffraction pattern with streaks, corresponding to θ S ...
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