The dispersed laser-induced fluorescence spectrum of gas-phase C₆₀ at 308 nm

We have recorded the dispersed laser-induced fluorescence spectrum of gas-phase C₆₀ ablated from a rotating copper cylinder by 308 nm radiation from a XeCl excimer laser. At vibrational energies below 7000 cm^-1 the spectrum consists of three progressions of transitions to the electronic ground state ending on the odd vibrational levels of the lowest frequency t_2u mode, with the lowest h_u and g_u modes as additional origins or on the vibrational levels of the third h_g mode with two quanta of the lowest g_u mode and the combination h_u(1)+g_u(1) as the additional origins. At higher vibrational energies, the observed bands become more complex and have yet to be analysed.