Abstract
High-purity crystals of 99.1% 13C enriched C 60 have been produced and their Raman and fluorescence spectra recorded together with those of C 60 crystals containing the 13C isotope in natural abundance. The relative frequency shift of the intramolecular Raman-active modes is found to be determined by the square root of the averaged mass of the C 60 molecules. From the observed blue-shift of the electronic origin of the fluorescence spectrum of C 60 upon 12 C → 13 C substitution, it is concluded that the averaged intramolecular vibrational frequency of C 60 decreases slightly upon electronic excitation.
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