4 papers · 1 filter
Low-energy excess of vibrational states in v-SiO2: the role of transverse dynamics
O. Pilla, A. Fontana, J. R. Goncalves +2
The study of the effects of the density variations on the vibrational dynamics in vitreous silica is presented. A detailed analysis of the dynamical structure factor, as well as of…
The nature of the short wavelength excitations in vitreous silica: X-Rays Brillouin scattering study
O. Pilla, A. Cunsolo, A. Fontana +6
The dynamical structure factor (S(Q,E)) of vitreous silica has been measured by Inelastic X-ray Scattering varying the exchanged wavevector (Q) at fixed exchanged energy (E) - an e…
Frustration and sound attenuation in structural glasses
L. Angelani, M. Montagna, G. Ruocco +1
Three classes of harmonic disorder systems (Lennard-Jones like glasses, percolators above threshold, and spring disordered lattices) have been numerically investigated in order to…
The Raman coupling function in amorphous silica and the nature of the long wavelength excitations in disordered systems
A. Fontana, R. Dell'Anna, M. Montagna +6
New Raman and incoherent neutron scattering data at various temperatures and molecular dynamic simulations in amorphous silica, are compared to obtain the Raman coupling coefficien…