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Unique intensity features arising from dynamical diffraction arise incoherent x-ray nanobeam diffraction patterns of crystals having thicknesseslarger than the x-ray extinction depth or exhibiting combinations of nanoscaleand mesoscale features. We demonstrate that dynamical scattering effects can beaccurately predicted using an optical model combined with the Darwin theory ofdynamical x-ray diffraction. The model includes the highly divergent coherentx-ray nanobeams produced by Fresnel zone plate focusing optics and accounts forprimary extinction, multiple scattering, and absorption. The simulationaccurately reproduces the dynamical scattering features of experimentaldiffraction patterns acquired from a GaAs/AlGaAs epitaxial heterostructure on aGaAs (001) substrate.

Dynamical Scattering in Coherent Hard X-Ray Nanobeam Bragg Diffraction