Photoinduced absorption of oxygen free C/sub 60/ film

Summary form only given. We report the photoinduced absorption of oxygen free C/sub 60/ thin film. The thin films of oxygen free C/sub 60/ are produced by evaporation onto sapphire substrate. At energies between 1.65 eV and 2.35 eV, there are two peaks; one at about 1.95 eV and the other at about 2.25 eV which is broader than the former. From the time resolved study of the peak at 1.95 eV, we can conclude that the lifetime of this peak is 40/spl mu/s in the case of oxygen containing film. In the case of oxygen free film, we still can not determine the lifetime of this peak.