Abstract
High-quality ${\mathrm{C}}_{60}$ films, with a thickness of about 100 \AA{}, were epitaxially grown on in vacuo cleaved GeS(001) single crystal surfaces and characterized with helium atom diffraction. Phonon dispersion curves of the ${\mathrm{C}}_{60}(111)$ surface were obtained from high-resolution inelastic helium atom time-of-flight (TOF) spectra. Pronounced inelastic peaks corresponding to the Rayleigh modes and to the frustrated rotations (librations) of the ${\mathrm{C}}_{60}$ molecules were observed along the 〈110〉 and 〈112〉 directions. The anharmonicity of the librations was found to be slightly larger than in the bulk ${\mathrm{C}}_{60}.$ The contribution of the ${\mathrm{C}}_{60}$ vibrations (without librons) to the inelastic TOF peak intensities was estimated from lattice dynamic calculations based on the intermolecular potential of Girifalco [J. Phys. Chem. 92, 858 (1992)].
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