Probing the modifier precursor state : adsorption of CO on Sn/Pt(111) surface alloys

摘要: The presence of a second, inert metal component in an alloy surface can have dramatic effect on the adsorption kinetics compared to that predicted from simple site-blocking. This is due important role often played by modifier precursor state [Xu and Koel, J. Chem. Phys., press]. In order more clearly reveal details concerning this state, thermodynamics CO Pt(111) two ordered Sn/Pt(111) alloys been studied. only slightly influenced Sn. contrast thermodynamics, nature depends strongly difference be explained fact strong chemisorption mainly determined chemical bonding forces, while physisorption forces because their influence states.