FLUORESCENCE OF C-60 AND C-70

The fluorescence of C60 and C70 in cyclohexane at room temperature have been measured, providing excitation spectra which completely mimic the corresponding absorption spectra of these compounds. The assignment of the 0 --> 0 components in the fluorescence spectra is discussed, the conclusion being that both fullerenes must have very small Stokes' shifts. The presence of oxygen, at least at the concentrations corresponding to air-equilibrated cyclohexane (2.1 x 10(-3) M), has no significant influence on the quantum yields of these weak fluorescences.