Abstract
THE wave-length of the beam of an electron microscope, compared with visible light, is the property akin to colour. The beam is ‘monochromatic’ and it is standard practice to maintain it so within very narrow limits. The wave-length for electrons, in terms of their velocity expressed in electron volts, is given by the equation λ = √(150/V) Angstrom units, where λ is the wave-length and V is the voltage accelerating the electrons. The ‘colour’ (wave-length) of the electron beam is varied by varying the voltage accelerating the electrons.
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References
Donovan, G. E., Lancet, i, 832 (1951).
Donovan, G. E., and Jones, G., Proc. Roy. Soc. Med., 44, 816 (1951).
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DONOVAN, G., STAFFORD, E. Colour in Electron Microscopy. Nature 170, 1126–1127 (1952). https://doi.org/10.1038/1701126b0
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DOI: https://doi.org/10.1038/1701126b0
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