Raman scattering inC60and alkali-metal-dopedC60films
| Autor: | Ying Wang, H. F. Ni, J.M. Holden, G. Dresselhaus, Kai-An Wang, S. L. Ren, G. T. Hager, M. S. Dresselhaus, Ping Zhou, P. C. Eklund |
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| Rok vydání: | 1992 |
| Předmět: | |
| Zdroj: | Physical Review B. 45:1955-1958 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.45.1955 |
| Popis: | The Raman-active modes of solid films of ${\mathrm{C}}_{60}$ and ${\mathit{M}}_{\mathit{X}}$${\mathrm{C}}_{60}$ (x\ensuremath{\sim}6; M=K, Rb, Cs) have been studied experimentally. The mode activity is dominated by intraball interactions, and the effect of the ${\mathit{M}}^{+}$ ions on the ${\mathrm{C}}_{60}$ spectrum is observed to be almost insensitive to the radius or mass of the alkali metal. Tangential modes of solid ${\mathrm{C}}_{60}$ are observed to soften in ${\mathit{M}}_{6}$${\mathrm{C}}_{60}$ by \ensuremath{\sim}60 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$, which can be attributed to a charge-transfer-induced elongation of the intraball bond lengths, similar to that observed in graphite intercalation compounds. Conversely, the radial modes are found to upshift slightly, indicating that a competing mechanism counteracts the effect of the bond elongation. |
| Databáze: | OpenAIRE |
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