Abstract
We report high-resolution far-infrared transmission measurements on 2D rhombohedral and 1D orthorhombic high-pressure-high-temperature C60 polymers and the doubly-bonded dimer, between 20 and 650 cm-1. Symmetry-breaking of the linked C60 balls is evident in splittings and activations of intramolecular modes. We find overall good agreement with predictions of group theory for the reduced-symmetry point groups of the R-polymer and Dimer. An overabundance of activated modes between 500 and 600 cm-1 in the O-polymer makes a confirmation of its symmetry more tentative. In all three structures, a strong multiplet near 610 cm-1 suggests a very large splitting or frequency shift of an Ih C60 fundamental mode, implying that a weak perturbation model cannot adequately describe the vibrational properties of bonded fullerenes.
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