Numerical simulations of scattering speckle from phase ordering systems

摘要: Abstract The scattering of coherent X-rays from dynamically evolving systems is currently becoming experimentally feasible. scattered beam produces a pattern bright and dark speckles, which fluctuate almost independently in time can be used to study the dynamics system. Here we report large-scale computer simulations speckle for phase-ordering system, using two-dimensional model quenched through an order-disorder transition into two-phase regime. intensity at each wave vectork found exponentially distributed random variable. scaling hypothesis extended two-time correlation function given vector, Corr(k;t1, t2). characteristic decay difference function,|t1 − t2|c, scale as k|t1 + t2|1/2.