In that case they obtained dominant Pd1 monomers and Pd2 dimers on the Pd67Ag33(111) alloy surface . Considering the different procedures for surface preparation, these results agree very well and fit perfectly to the results obtained for CO adsorption on the PdAg/Pd(111) surface alloys. Hence, CO adsorption on this bulk alloy seems to closely follow the trend derived for the PdAg/Pd(111) surface alloys, and the combined changes in the ligand and strain effects are small.