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Using angle-resolved photoemission spectroscopy, we show the direct evidenceof charge transfer between adsorbed molecules and metal substrate, i.e.chemisorption of CO on Pt(111) and Pt-Sn/Pt(111) 2x2 surfaces. The observedband structure shows a unique signature of charge transfer as CO atoms areadsorbed,revealing the roles of specific orbital characters participating inthe chemisorption process. As the coverage of CO increases, the degree ofcharge transfer between CO and Pt shows clear difference to that of Pt-Sn. Withcomparison to DFT calculation results, the observed distinct features in theband structure are interpreted as backdonation bonding states of Pt molecularorbital to the 2{\pi} orbital of CO. Furthermore, the change in the surfacecharge concentration, measured from the Fermi surface area, shows Pt surfacehas a larger charge concentration change than Pt-Sn surface upon CO adsorption.The difference in the charge concentration change between Pt and Pt-Sn surfacesreflects the degree of electronic effects during CO adsorption on Pt-Sn.

Understanding the roles of electronic effect in CO on Pt-Sn alloy surface via band structure measurements