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Fundamental and higher-order Raman spectra of C60 films.

Raman spectra of C60 films on gold and silicon substrates have been taken over the frequency range 200-3200 cm-1. Besides two A(g) and eight H(g) fundamental frequency modes, 16 weak peaks are observed. According to the selection rules of overtone and combination bands, most of them are attributed to the second-order Raman spectra of C60 molecules. A comparison of experimental results with theoretical predictions shows satisfactory agreement.