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dc.contributor.authorTzeng, CTen_US
dc.contributor.authorLo, WSen_US
dc.contributor.authorYuh, JYen_US
dc.contributor.authorChu, RYen_US
dc.contributor.authorTsuei, KDen_US
dc.date.accessioned2019-04-03T06:39:32Z-
dc.date.available2019-04-03T06:39:32Z-
dc.date.issued2000-01-15en_US
dc.identifier.issn1098-0121en_US
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevB.61.2263en_US
dc.identifier.urihttp://hdl.handle.net/11536/30801-
dc.description.abstractThe geometric and electronic structures of C-60 adsorption on Au(111) surfaces have been studied py low-energy electron diffraction (LEED), angle-resolved photoemission, and near-edge x-ray-absorption spectroscopy. An irreversible structural transition of the C-60 overlayer on Au(111) was observed by LEED upon successive annealing. These structures are 38 x 38 "in phase," R14 degrees and (2 root 3 x 2 root 3)R30 degrees, with the latter phase predominating after annealing to 350 degrees C. Valence-band photoemission spectra reveals a state right below the Fermi level for an annealed, ordered monolayer. This peak disperses across the Fermi energy that indicates the C-60 overlayer becomes metallic. Its intensity shows a resonance that primarily follows the behavior of highest occupied molecular orbitals, identified unambiguously as lowest unoccupied molecular orbitals (LUMO's) filled by charge transfer from the substrate. An asymmetric distribution of LUMO charge is observed. The thermal-desorption energy of the monolayer is estimated from annealing experiments to be 1.9 eV, which is 0.5 eV larger than the desorption energy from multilayers. Comparison with available spectroscopic data indicates that interaction of C-60 with Au(111) is slightly weaker than with Au(110), and much weaker than with Cu(111). The amount of charge transfer estimated from photoemission is 0.8 electrons per C-60 molecule on Au(111), compared to 1.6 electrons on Cu(111). We argue that charge transfer is determined by the bulk sp density of states at the Fermi energy scaled by the size of the C-60 molecule, and also modified by a clean surface electronic structure, and that charge transfer is the dominant interaction in these systems.en_US
dc.language.isoen_USen_US
dc.titlePhotoemission, near-edge x-ray-absorption spectroscopy, and low-energy electron-diffraction study of C-60 on Au(111) surfacesen_US
dc.typeArticleen_US
dc.identifier.doi10.1103/PhysRevB.61.2263en_US
dc.identifier.journalPHYSICAL REVIEW Ben_US
dc.citation.volume61en_US
dc.citation.issue3en_US
dc.citation.spage2263en_US
dc.citation.epage2272en_US
dc.contributor.department物理研究所zh_TW
dc.contributor.department光電工程研究所zh_TW
dc.contributor.departmentInstitute of Physicsen_US
dc.contributor.departmentInstitute of EO Enginerringen_US
dc.identifier.wosnumberWOS:000085760200098en_US
dc.citation.woscount123en_US
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