Seminars Archive

Study of the High Frequency Dynamics in Glass-Forming Systems

Abstract
The development of inelastic x-ray scattering (IXS) with meV energy resolution at the European Synchrotron Radiation Facility in Grenoble (France), provides a method for studying high-frequency collective dynamics in disordered systems. This has led to the observation of propagating acoustic phonon-like excitations in glasses and glass-forming liquids down to wavelengths approaching the interparticle separation region. We will show that the microscopic dynamic properties are related to the excess of vibrational states in glasses usually observed in the 1 - 10 meV energy region. Moreover, the study of the temperature dependence of the high frequency excitations measured by IXS, allows to better understand the complex relaxation pattern of glass-forming systems.