LASER-INDUCED FLUORESCENCE LINE-NARROWING OF C-60-HYDROQUINONE CRYSTALS

The low temperature optical spectroscopy of C-60-hydroquinone (C-60(HQ )(3)) crystals has been studied by fluorescence line-narrowing and tot al luminescence spectroscopy. The spectra are characterized by sharp z ero-phonon lines and phonon sidebands of neutral C-60. Symmetric h(g) and a(g) modes and progressions in the Jahn-Teller active 260 cm(-1) h (g) squashing mode dominate the fluorescence spectra indicating the he xagonal environment of the crystal has distorted the C-60 icosahedral symmetry. There may also be a Jahn-Teller distortion of the excited st ate. The line-narrowing experiments show there is substantial inhomoge neous broadening because of rotational disorder in the crystal.