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Monolayers of zinc-phthalocyanine deposited on highly oriented pyrolytic graphite (HOPG) substrate have been investigated by scanning tunneling microscopy. At the coverage of 1 ML, ZnPc layers show stripes with twined domains along threefold symmetry. The separations between the stripe lines are 6 nm and the heights of the monolayers are 1.2 nm. This structure can be explained by a corresponding superstructure...
Scanning tunneling microscopy (STM) images of adenine molecules on Si(100)2 × 1 surfaces have shown for the first time that the adenine is adsorbed on a Si dimer row. The double bright molecular images are located on the neighboring two Si dimer rows and have ellipsoidal shapes. An extended Hückel molecular orbital calculation of the adenine adsorbed on the Si cluster gives the form of the hybridized...
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