Abstract
We present a detailed account of an inelastic neutron scattering study of the intermolecular vibrations in solid C60 above and below the structural phase transformation. Assignment of the observed phonon peaks to modes of translational and librational character is discussed on the basis of lattice dynamical calculations using phenomenological intermolecular potentials. A new bond charge model is presented which reproduces the observed phonon branches very well. However, the apparently small influence of the orientational disorder on the librational excitations remains to be understood.
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