Observation of Collective Molecular Dynamics in a Chalcogenide Glass: Results from X-ray Photon Correlation Spectroscopy.

The structural relaxation processes in a GeAsS molecular chalcogenide glass sample were directly studied by X-ray photon correlation spectroscopy (XPCS). XPCS was conducted at the first sharp diffraction peak at = 1.16 Å at temperatures ranging from 123 K to above the glass transition at 328 K, and the results showed two different dynamical regimes.