1. Neutron scattering study of the vibrations in vitreous silica and germania.
- Author
-
Fabiani, E., Fontana, A., and Buchenau, U.
- Subjects
VIBRATIONAL spectra ,FUSED silica ,X-ray scattering ,MOLECULAR dynamics ,QUANTUM theory - Abstract
The incoherent approximation for the determination of the vibrational density of states of glasses from inelastic neutron or x-ray scattering data is extended to treat the coherent scattering. The method is applied to new room temperature measurements of vitreous silica and germania on the thermal time-of-flight spectrometer IN4 at the High Flux Reactor in Grenoble. The inelastic dynamic structure factor at the boson peak turns out to agree reasonably well with simulation results, but the long-wavelength fraction exceeds the expectation of the Debye model, in particular, in germania. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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