Abstract
The observation of the surface-enhanced vibrational Raman spectra of vapor-deposited C 60 and C 70 on rough silver films is reported. Both near-monolayer and multilayer films of pure C 60 and of C 60/C 70 mixtures are studied. The films are obtained by evaporating fullerene samples at temperatures of 683–875 K in ultra-high vacuum. Mixed fullerene samples were greatly enriched in C 70 by making use of the slightly different vapor pressures of the two major components at the low end of this temperature range. The spectra contain all the lines of the normal Raman spectra as well as several additional lines caused by a reduction in the stringency of the normal Raman selection rules. These results demonstrate the potential of this technique for detecting small quantities of fullerenes and obtaining their vibrational spectra.
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