X-ray moire fringes-I

What is it about?

The phenomenon of crystal-diffraction moire fringes is important not only as a most sensitive detecting means of crystal strain, but also from the viewpoint of basic research in crystal-diffraction physics. This paper presents a detailed theoretical description of the diffraction moire fringes in X-rays, where special attention is paid to the fact that the moire fringes are a combination of pure moire interference in crystal lattices and the Pendelloesung intensity oscillation of dynamical crystal diffraction.

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Why is it important?

How the interference phase of moire fringes is modulated by the effect of Pendelloesung diffraction-intensity oscillation under the existence of crystal strain is studied in detail. It is revealed that the phase modulation causes an abrupt jump of moire fringes by half a period, irrespective of the associated reciprocal-lattice-vector difference which causes the intrinsic moire fringes.