The Raman coupling function in disordered solids: a light and neutron scattering study on glasses of different fragility

We report new inelastic Raman and neutron scattering spectra for glasses with different degrees of fragility, v- SiO2, v- GeO2, (AgI)(0.5) (Ag2O-B2O3)(0.5), (AgI)(x)(AgPO3)(1-x). The data are compared for each sample to obtain the Raman coupling function C(omega). The study indicates a general linear behaviour of C(omega) near the boson peak maximum, and evidences a correlation between vibrational and relaxational properties, confirming the results of recent publications.