We have spatially resolved the local electronic structure of a C-60 monolayer on Ag(001) using scanning tunneling spectroscopy at T=7 K. Our measurements resolve four band states derived from C-60 highest occupied molecular orbital, lowest unoccupied molecular orbital (LUMO), and LUMO+1. We observe spatial inhomogeneity in the energy-resolved local density of states, which reflects C-60 internal structure. In addition, we are able to resolve the molecular orientation of coexisting bright and dim C-60 molecules in the monolayer. This combination of topographic and spectroscopic measurements provides further evidence that the appearance of bright and dim molecules originates from a Ag surface reconstruction.
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