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Figure 4
The Ewald construction: Ewald's sphere of radius [1/\lambda] (solid circle) depicts all possible scattering wavevectors [{\bf q}] under the current setup. Lattice planes with Miller indices (hkl) are represented by points on the reciprocal lattice (black dots). For wavelength λ, no reciprocal-lattice point is on Ewald's sphere implying that no scattering signal will be generated at any scattering angle. If the wavelength is appropriately tuned, some reciprocal-lattice points can fall on the new Ewald sphere (dashed circle) to satisfy Bragg's law, for instance, [(\bar{1}20)].

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