Abstract
Transient x-ray speckle patterns at 0 K in the early stage of photoinduced nucleation processes are theoretically studied. By employing a model of localized electrons coupled with quantized phonons, we found that various types of speckles appear in diffraction patterns, and that the nature of the incubation period and/or coalescence of photoinduced domains is discussed by their time-dependent profiles or their two-time correlation function g (2) . Thus, measurement of transient x-ray speckles by ultrashort coherent x-ray pulses will be a direct way to reveal the mechanism of photoinduced structural change.
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