Evidence of anomalous dispersion of the generalized sound velocity in glasses

B. Ruzicka, T. Scopigno, S. Caponi +7

The dynamic structure factor, S(Q,w), of vitreous silica, has been measured by inelastic X-ray scattering in the exchanged wavevector (Q) region Q=4-16.5 nm-1 and up to energies hw…