Hyper-Raman scattering from vitreous boron oxide: coherent enhancement of the boson peak
Abstract
Hyper-Raman scattering spectra of vitreous B2O3 are reported and compared to Raman scattering results. The main features are indexed in terms of vibrations of structural units. Particular attention is given to the low frequency boson peak which is shown to relate to out-of-plane librations of B3O3 boroxol rings and BO3 triangles. Its hyper-Raman strength is comparable to that of cooperative polar modes. It points to a sizeable coherent enhancement of the hyper-Raman signal compared to the Raman one. This is explained by the symmetry of the structural units.
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