When measuring supelattice in high resolution x-ray diffraction, what is the meaning of satellites arranged in pairs?
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Satellites arranged in pairs in high resolution x-ray diffraction measurements of superlattices indicate the presence of interfacial layers and the quality of the superlattice structure. These satellites are observed as sharp higher-order reflections in the x-ray diffraction profiles . The modulation of the satellite groups belonging to different substrate reflections can be attributed to an incommensurate modulation of the superlattice . The diffracted intensity close to strong substrate reflections provides information about the structural parameters of the superlattice, but the phase information is lost . The weak even-order satellite peaks and the shift in the zero-order diffraction peak suggest the presence of strained monolayers and atomic exchange at the superlattice interfaces . The observation of satellite peaks due to corrugations in the substrate indicates the influence of the substrate on the superlattice structure .
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