Surface-enhanced Raman scattering and photoemission of C sub 60 on noble-metal surfaces
- Department of Physics, Penn State University, University Park, Pennsylvania 16802 (United States)
Surface-enhanced Raman scattering of monolayer C{sub 60} deposited in UHV on noble metals yields substantial shifts of the high-frequency, {ital A}{sub {ital g}}(2) pentagonal pinch mode. These shifts, which increase in the series Au, Cu, and Ag, are attributed, in part, to charge transfer to the fullerene. This behavior is consistent with a decrease in noble-metal work function in this sequence. Confirmation of charge transfer in Cu and Ag is directly obtained by He I, ultraviolet photoemission spectroscopy measurements which indicate formation of a lowest-unoccupied-molecular-orbital (LUMO) -derived band similar to that observed in K{sub 3}C{sub 60} and Rb{sub 3}C{sub 60}. The form and Fermi edge behavior of the LUMO-derived band further imply the formation of a metallic interfacial layer. X-ray photoemission spectroscopy measurements indicate shifts of the C 1{ital s} core level which differ from trends noted in Raman scattering, suggesting that interfacial effects beyond charge transfer may be important.
- DOE Contract Number:
- FG02-84ER45095
- OSTI ID:
- 7017872
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 46:12; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPPER
SORPTIVE PROPERTIES
FULLERENES
CHEMISORPTION
PHOTOEMISSION
RAMAN EFFECT
GOLD
SILVER
ELECTRONIC STRUCTURE
WORK FUNCTIONS
CARBON
CHEMICAL REACTIONS
ELEMENTS
EMISSION
FUNCTIONS
METALS
NONMETALS
SECONDARY EMISSION
SEPARATION PROCESSES
SORPTION
SURFACE PROPERTIES
TRANSITION ELEMENTS
360606* - Other Materials- Physical Properties- (1992-)