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