Photochemical properties of carbon clusters such as C
60 and C
70 have been widely studied on the viewpoints of scientific and technological interests. Photo-illumination of fullerenes leads to their excited states which have different character from that of the ground state. For example, an increase in the photoinduced electric conductivity of polymers was found by doping with C
60 and C
70. Fullerenes such as C
60 and C
70 show photoinduced charge separation from their excited states in the presence of appropriate electron donors or acceptors. These photochemical studies are the basis of potential uses of fullerenes as each particle material. The laser flash photolysis studies in solution, solid films, and fine particles are reviewed.
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