Abstract: After being irradiated in air by XeCl (308 nm) excimer laser, the electrical conductivity of solid thin-film C$-60$/ has been improved by more than six orders of magnitudes. The products resulting from laser irradiation of C$-60$/ films have been investigated by Raman scattering and the onset of conductivity can be attributed to laser-induced oxygenation and disintegration of fullerene. Irradiated by approximately 40 ns laser pulses with different fluence, the products with different microstructure were observed. At lower fluence, the Raman features of microcrystalline graphite and fullerene polymer were observed. At a fluence just below the ablation threshold (36 mJ/cm$+2$/), the fullerene molecules in film were disintegrated completely and transformed to amorphous graphite.!16
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