| Bragg's Law |
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Bragg's law is the result of experiments into the diffraction of X-rays or neutrons off crystal surfaces at certain angles, derived by physicist Sir William Lawrence Bragg in 1912 and first presented on 1912-11-11 to the Cambridge Philosophical Society.
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When a beam of x-rays strikes a crystal surface in which the layers of atoms or ions are regularly separated, the maximum intensity of the reflected ray occurs when the complement of the angle of incidence, θ, the wavelength of the x-rays, λ, and the distance betwen layers of atoms or ions, d, are related by the equation, |
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n x λ = 2d x sinθ |
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where, n is an integer determined by the order given.
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