Irradiation Effect In C_(60) Films Induced by Energetic Ions

Irradiation effecs (mainly including transformation from crystalline into amorphous state) of C 60 films induced by 120 keV H, He, N, Ar, Fe and Mo ions, 240 keV and 360 keV Ar ions, and 171.2 MeV, 125.3 MeV and 75.8 MeV S ions were analysed by means of Raman scattering and XPS technique. The analysis results indicate that amorphization process in the cases of N, Ar, Fe and Mo ions irradiation is dominated by nuclear collision, but in the case of H ion irradiation, the process is dominated by electron energy transfer. The annealing effect of electron energy loss which induced the intermediate graphitization process before amorphization in lower irradiation dose ranging from 2×10 14 to 5×10 16 ions/cm 2 was found in the case of H ion irradiation for the first time. In the case of swift S ion irradiation, the destruction action of the strong electronic excitation exceeds the anneaning effect, and therefore there is no intermediate graphitization process.