Abstract
The inelastic neutron scattering in glasses is considered as a method of determining the atomic structure of the two-level tunnelling states. Both resonant and relaxation scattering processes are considered. The first gives the broad asymmetric energy distribution and the second describes the central peak. It is shown that for amorphous SiO2 (vitreous silica) at low temperatures the resonant and one-phonon scattering have the same order of magnitude. The conditions for the observation of the two-level scattering are also considered and the experimental results on the inelastic neutron scattering from glasses are discussed briefly.
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