Abstract
The effects of crystallinity and diffused oxygen molecules on the photo-induced transformation of C 60 films and single crystals have been studied by Raman scattering and optical absorption measurements. With laser irradiation onto C 60 films, the Raman intensities of the original C 60 molecular vibrational modes decreased exponentially with nearly the same time constants, and simultaneously some new modes appeared. The time constants of newly appearing modes were classified into, at least, three groups, suggesting that the photo-induced transformation occurs with multi-steps. We have found that the photo-induced phenomena in single crystals depend strongly on the laser irradiance and the presence of oxygen molecules in the C 60 lattice. An oxygen-diffused C 60 single crystal was easily transformed to a glassy graphitic phase by laser irradiation. The phototransformation from solid C 60 to the graphitic phase is also discussed.
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