Abstract
To observe diffraction from crystals it is necessary to have a source of radiation whose wavelength is of the same order as the atomic spacings. ‘Sources of radiation’ shows that the electromagnetic spectrum’s X-ray region does this nicely and describes the use of X-ray tubes. Another source of radiation is synchrotron radiation, which exhibits a number of special properties: the radiation emitted ranges from the hard X-ray region, through the ultraviolet and infra-red wavelengths up to visible light; the X-ray beam is plane-polarized within the horizontal plane; and the radiation is highly collimated in the vertical plane. Radiation from free-electron lasers, neutron sources, and electron diffraction is also discussed.
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