PHOTOASSISTED OXYGEN DOPING OF C-60 FILMS

C60 films simultaneously exposed at T = 300 K to oxygen and visible-ul traviolet light are found to exhibit rapid diffusion of oxygen into th e deep bulk of the film. The diffusion rate is found to be approximate ly 10 times faster in the presence of light. Vibrational and optical a bsorption spectroscopy indicate that the photoassisted reaction of O2 with solid C60 involves two coupled reactions: (i) the photoassisted d iffusion of molecular oxygen into solid C60 and (ii) oxidation of C60.