Abstract
The low temperature optical spectroscopy of C 60-hydroquinone (C 60(HQ) 3) crystals has been studied by fluorescence line-narrowing and total luminescence spectroscopy. The spectra are characterized by sharp zero-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 hexagonal environment of the crystal has distorted the C 60 icosahedral symmetry. There may ae a Jahn-Teller distortion of the excited state. The line-narrowing experiments show there is substantial inhomogeneous broadening because of rotational disorder in the crystal.
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