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The incoherent approximation for the determination of the vibrational densityof states of glasses from inelastic neutron or x-ray scattering data isextended to treat the coherent scattering. The method is applied to new roomtemperature measurements of vitreous silica and germania on the thermaltime-of-flight spectrometer IN4 at the High Flux Reactor in Grenoble. Theinelastic dynamic structure factor at the boson peak turns out to be reasonablywell described in terms of a mixture of rotation and translation of practicallyundistorted SiO4 or GeO4 tetrahedra. The translational component exceeds theexpectation of the Debye model by a factor of two. A possible relation of thisexcess to the phonon shift and broadening observed in x-ray Brillouinscattering experiments is discussed.Comment: 13 pages, 13 figures, 39 reference

Neutron scattering study of the vibrations in vitreous silica and germania