Fluorescence spectra of ${\mathrm{C}}_{60}$ in n-hexane at room temperature, obtained under excitation at 514.5 and 337.1 nm, are presented. The spectra were measured with subnanosecond laser excitation in a 5-ns gate synchronous with the excitation. The emission, in the range 1.5 to 2.2 eV for excitation at 514.5 nm (2.41 eV), is characterized by a narrow peak at 2.05 eV (i.e., 606 nm, 7.2 nm FWHM) which is predominant in the spectrum, while many resolved vibronic structures emerge, down to energies as low as 0.4 eV, in the spectrum obtained with excitation at 337.1 nm (3.68 eV).

• Received 15 November 1993

DOI:https://doi.org/10.1103/PhysRevLett.72.844