grating
grating
The grating is an element to obtain a spectrum utilizing diffraction. It is made of a metal and many equally spaced grooves are cut on the surface. (The minimum spacing between the grooves that can be cut is ～0.5 μm.) The spacing must be suitable for the wavelength of the spectrum to be measured. In order to obtain a spectrum from a wide energy range, several gratings with different groove spacings are required. Some gratings are designed to be cut with a non-equal pitch of grooves to reduce aberrations. The grating is used for electronic structure analysis by soft X-ray spectroscopy.
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