摘要
In literature, Csub 60 thin film was found to exhibit nonlinear photoconductivity, and nonlinear optical response. Under strong light irradiation, photopolymerization of the fullerene thin film can also occur. We carried out an ESR experiment to elucidate these unusual properties of Csub 60 thin film. Under UV light irradiation, an ESR band with a g value of 2.0025 grows gradually as a function of time. This ESR band was assigned to the Csub 60sup +.- on the basis of its g value. When light is off, the Csub 60sup +. band remains exist and is stable for more a month at room temperature. The temperature effect on the ESR line width was also studied. The mechanism of the formation of Csub 60sup +. and its correlation to photopolymerization and nonlinear photoconductivity will be discussed.