Abstract
A numerical vibrational-mode analysis has been performed for two structural models of vitreous silica constructed by molecular dynamics calculations using the Tsuneyuki and van Beest interatomic potentials. Traces of `phonons' are found from a Fourier analysis of the vibrational eigenmodes, and the related dispersion laws, both for longitudinal and transverse vibrations, have been calculated. The low-frequency eigenmodes in the boson peak region are analysed.
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