Coherent X-ray study of fluctuations during domain coarsening

We report observations of the dynamics of the exact structure factor (speck le pattern) during phase separation in a sodium borosilicate glass, measure d using intensity fluctuation spectroscopy with a coherent x-ray beam. None quilibrium fluctuations in the structure factor are analyzed using a two-ti me correlation function to extract the time-dependent and wave-number-depen dent correlation time. The behavior of the correlation time is in agreement with a scaling law previously found in simulations.