Vibrational Modes in C60 and C60 Polymer

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Abstract
The vibrational properties of oxygen-free C60 films indicate the nearly ideal molecular nature of solid C60. Numerous sharp Raman lines (∼98) and infrared lines (∼98) were observed and assigned to first-order modes, or combination and overtone intramolecular mode frequencies of C60. Analysis of these vibrational modes yields a complete, self-consistent set of the 46 fundamental intramolecular mode frequenciesof a C60 molecule. Irradiation of oxygen-free C60 films with visible or ultraviolet light phototransformed C60 to a new polymeric phase. We present experimental evidence which suggests the formation of covalent C-C bonds between C60 molecules in the polymeric phase. Furthermore, the rate for thermal dissociation of these intermolecular bonds is found to follow an Arrhenius' type behavior with an activation energy Ea = 1.25 eV. Our experimental results will also be compared to recent thcoretical calculations and connected with the photophysical bchavior of C60.

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