Abstract
The adsorption of SO 2 on clean Cu(100) and Cu(100)- c(2 × 2)- O surfaces at room temperature has been studied using high resolution core-level photoelectron spectroscopy. On both surfaces, two types of atomic S and two types of SO 3 are found as shown by their well separated S 2p binding energies. On the Cu(100)- c(2 × 2) O surface, pre-adsorbed oxygen inhibits the SO 2 decomposition and accelerates the SO 2 reaction with the substrate which benefits SO 3 formation.
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