Résumé
The following sections are included:
Introduction
Inelastic Light Scattering
General
Brillouin scattering
Low-frequency Raman scattering
Experimental aspect
Models for the Hypersonic Properties of Glasses
Models for the attenuation
Resonant absorption by two-level systems
Relaxational absorption by two-level systems
Scattering by disorder
Interaction with thermal phonons — anharmonicity
Thermally activated relaxational processes
Temperature dependence of the velocity
The Boson Peak
General presentation
Models for the boson peak
Martin and Brenig model
Maximum in the density of vibrational modes
Connection with medium-range order
Connection with hypersonic velocity
Quasi-Elastic Scattering
Models accounting for both the boson peak and the quasi-elastic scattering
Soft-potential model
Vibration-relaxation
Gochiyaev's coupling model
Theodorakopoulos and Jäckle's model for the quasi-elastic scattering
Connection with hypersonic attenuation
Evidence of two-level systems
Conclusions
Acknowledgments
References