Physical Review Letters · 2000 · 149 citations · 25 references
Natural SciencesMaterials SciencePhysicsMaterials PhysicsSpectroscopyVibrationGlass MaterialsInfrared SpectroscopyOptical Properties Of MaterialsOptical SpectroscopyRaman SpectroscopyVibrational SpectroscopyRaman ScatteringRaman SpectraSilicate GlassesStrong Coupling ConstantVibrational Density Of StatesVibrational Excited StatesVibrational Mode AssignmentVibrational Quantum States
Hyper-Raman spectroscopy is used to investigate low frequency vibrations of various silica glasses. A strong boson peak is observed. The corresponding modes are inactive in infrared and Raman spectra, and are nonacoustic in nature. The shape of this boson peak essentially matches the total density of vibrational states (DOS), with a constant coupling coefficient C. This and other indications suggest that these modes actually dominate the DOS of silica.
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Measurements of Nonlinear Light Scattering
R. W. Terhune, P. D. Maker, C. M. Savage · Physical Review Letters · 1965 · 575 citations
Low-frequency modes in vitreous silica
U. Buchenau, M. Prager, N. Nücker et al. · Physical review. B, Condensed matter · 1986 · 553 citations