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Diffraction grating

Diffraction grating

C028/2576

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Credit

SCIMAT / SCIENCE PHOTO LIBRARY SCIMAT / SCIENCE PHOTO LIBRARY

Caption

Colour enhanced transmission electron micrograph (TEM) of a germanium and carbon replica of diffraction grating on a 200-mesh, 3.05 mm grid. The diffraction grating itself consists of a glass plate or a mirror with a large number of equidistant parallel lines or grooves on its surface; it is used to disperse a beam of light (or other electromagnetic radiation) into wavelengths to produce a spectrum. This has a spacing of 462.9nm, 2160 lines per millimetre, ideal for calibrating electron-optical magnification up to the x80,000-100,000 range. The ridges of the grating are sharp (light in colour, as if lighted from the left upper corner) and the valleys are dark and contain some very fine debris. Image width: 3.65 micrometers. Magnification: 27,300x if printed 10 cm wide. Bar: 0.5 micrometre.

Release details

Model release not required. Property release not required.

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