Abstract
Real-space structural characterization of benzene (C6H6) adsorbed on the graphite (0001) surface was investigated at the nanoscale. Scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED) were used to assign a well-ordered 7×7R19.1° structure at around monolayer coverages. The STM image clarified the flat-lying adsorption of benzene with its molecular plane parallel to the surface. At a sample bias around the adsorption-induced highest occupied molecular orbital (HOMO) level, the STM image showed an elongated protrusion separated by a single nodal depression; this is because the degeneracy of the HOMO is lifted by the interaction with the substrate.
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