Abstract
The effects of photo-irradiation onto C60 single crystals under high pressure to 27 GPa were investigated by photoluminescence and Raman scattering measurements. While the PL band, which was observed originally at 1.68 eV at ambient pressure, returned to the initial position reversibly after releasing pressure without photo-irradiation, the PL band with photo-irradiation under pressure did not return to the initial position and its redshift depended on the applied pressure (∼—12 meV /GPa). In Raman spectra, a new mode appeared at about 10 cm—1 lower than the Ag(2) mode at ambient pressure as a result of the formation of a polymeric phase after photo-irradiation under high pressure. The frequency of the new mode also depended on the applied pressure. The observations suggest that a new fullerene network is formed by large-scale, strong intermolecular bonds that differ from the [2 + 2] cycloadditional ring structure.
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