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Bragg's Law

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Bragg's law describes the reflection of a monochromatic x‐ray beam by two parallel crystalline planes separated by a distance . The difference in path lengths is equal to and this determines a necessary condition for constructive interference from a family of parallel planes. The Bragg condition enables spacings between many different sets of crystalline planes to be determined.

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For adequate choice of angle, phase and frequencies, the lattice distance exhibit constructive interference, otherwise, the X-rays interfere destructively and there is no diffraction pattern (resulting wave in red).

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Contributed by: Enrique Zeleny (February 2009)
Open content licensed under CC BY-NC-SA

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