Inelastic neutron scattering experiments have been performed in melt-quenched vitreous Germania, v-GeO2, at room temperature. Coherence effects have been observed in the dynamical structure factor over the collective excitations energy range. Indeed, because of the relatively low velocity of sound of this system (3600 m/s), the linear low-q region of the (q,omega) dispersion relationship was accessible to the neutron experiment.
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