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An X-ray monochromator is an instrument used in spectroscopy to isolate a narrow band of X-ray wavelengths from a broader spectrum. This is achieved by utilizing the principle of Bragg reflection, where X-rays striking a crystal at a specific angle are reflected constructively if their wavelength satisfies the Bragg condition: 2d sin \u03b8 = n\u03bb.1

Similar to how optical monochromators work, X-ray monochromators use crystals with known lattice spacings to measure and identify unknown X-ray wavelengths. They can isolate a small portion of a continuous X-ray spectrum, and by adjusting the crystal's angle, the selected wavelength can be tuned. This allows for precise analysis in various scientific applications, including materials science and physics.12

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