Quasi-elastic scattering in glasses and its relation to sound absorption
Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
Accepted: 21 February 1997
The quasi-elastic Raman scattering in and PS glasses is analyzed in the framework of the model of a damped oscillator. The model ascribes the quasi-elastic contribution to the scattering of light on damped vibrations which have a quasi-elastic part in their response function. With additional assumption that the vibrations around the boson peak are damped by the same process as the acoustic waves, a good agreement is obtained between acoustic attenuation data and QES spectra in and polystyrene both on a qualitative and a quantitative level.
PACS: 63.50.+x – Vibrational states in disordered systems / 78.30.Ly – Disordered solids / 62.80.+f – Ultrasonic relaxation
© EDP Sciences, 1997