Excited-state properties of C60

Abstract The excited singlet-state and triplet-state properties of C 60 in toluene have been measured by picosecond and nanosecond laser-flash photolysis. S 1 has absorption maxima at 513, 759 and 885 nm with differential molar extinction coefficients (Δϵ S ) of 4500, 3700 and 6300 M −1 cm −1 , respectively. T 1 has absorption maxima at 457, 509 and 747 nm with Φ T Δϵ T =3400, 3000 and 15000 M −1 cm −1 , respectively. The lifetime of S 1 is 1.2 × 10 −9 s and that of T 1 is ⩾ 2.8 × 10 −4 s. T 1 also undergoes triplet—triplet annihilation with a rate constant ⩾ 4.8 × 10 9 M −1 s −1 .

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