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The chemistry of CO and D2O, individually adsorbed or co-adsorbed, on epitaxial thin films of samaria on Pt(111) was studied by temperature-programmed desorption spectroscopy (TPD). Continuous thin films as well as discontinuous films composed of samaria islands on bare Pt(111) were prepared. Their comparative study indicates that Sm2O3 islands provide lattice oxygen at their perimeter for CO oxidation...