X-Ray Rainbow

(a) White light at visible wavelengths gets spread out into its constituent colors by a prism.
(b) An X-ray beam is spread out into its constituent "X-ray colors" by Bragg diffraction from a crystal whose atomic planes are oriented at an angle to the surface of the crystal.

Reported by: Shvyd'ko et al., Physical Review Letters, 8 December 2006

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