Triplet Excited State and Radical Cation of C₆₀ form Pulse Radiolysis in Solutions

The transient absorption spectra or C₆₀ in benzene with and without CCl₄ or CCl₃CF₃ in pulse radiolysis have been measured in the visible region. Following the pulse radiolysis of C₆₀ in pure benzene solution, the generation of the excited triplet state ³C₆₀^* is observed at about 740nm via the triplet-triplet energy transfer form ³C₆H₆^* to C₆₀. The rate constants of quenching ³C₆₀^* by oxygen and the ground-state of C₆₀ have been determined to be 2×10⁹M^-1s^-1 and 9×10⁸M^-1s^-1, respectively. The pulsed radiolytic generation of radical canon C₆₀⁺. in benzene containing CCl₄ or CCl₃CF₃ via electron transfer from ³C₆₀^* to electron acceptor （CCl₄ or CCl₃CF₃） has been confirmed for the first time by the appearance of a novel absorption peak at around 650nm.