Diffraction Grating, TEM

Diffraction Grating, TEM

C028/2552 Rights Managed

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Credit: Scimat/SCIENCE PHOTO LIBRARY

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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 the image is printed 10 cm wide.

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Keywords: carbon replica, colour, constructive interference, destructive interference, diffraction, diffraction grating, dispersal, disperse, dispersive, electron micrograph, enhance, enhanced, frequency, germanium replica, light, micrograph, micrography, optical, optical device, optics, parallel grooves, parallel lines, physical, physics, shadowcast, shadowcast carbon replica, shadowcast tem, spectrum, tem, transmission electron micrograph, transmission electron microscope, wave, wave interference, wave nature, wavelength, wavelengths

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