Abstract
The inelastic neutron scattering from vibrations in glasses is reformulated. Carpenter and Pelizzari's treatment of the sound wave case is extended to higher frequencies where the plane-wave picture is expected to break down, but neighbouring atoms may still oscillate more or less in phase. If this description is adequate, it is possible to determine the vibrational density, of states and an average dispersion relation from neutron scattering measurements without separating coherent and incoherent contributions.
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