Abstract
Low-energy electron diffraction LEED indicates that the monolayer structure of C60 on Pb 111 comprises two coexisting incommensurate structures with nonsymmetry epitaxial rotations near 20° relative to the Pb 111 lattice. These structures are observed in scanning tunneling microscopy STM as Moire superstructures having periods of about 46 A and 34 A. The Moire images and LEED patterns are consistent with two higher-order commensurate HOC structures that were identified using the hexagonal number sequence method. These structures are close to predictions from the Novaco-McTague theory of epitaxial rotation, assuming a weakly corrugated substrate potential. As a consequence of the fullerenes within the Moire structures having different local environments, the energetic alignment of the molecular resonances is also modulated, with shifts measured by tunneling spectroscopy of up to 20 meV.
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