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Electron Microscopes

Biomedical Instrumentation & Technology, 2012
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Elements of a Transmission Electron Microscope

1984
Not only does the gun of an electron microscope emit electrons into the vacuum and accelerate them between cathode and anode, but it is also required to produce an electron beam of high brightness and high temporal and spatial coherence. The conventional thermionic emission from a tungsten wire is limited in temporal coherence by an energy spread of ...
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The Scanning Electron Microscope

Scientific American, 1972
Thomas L. Hayes, T. E. Everhart
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Electron Optics of a Scanning Electron Microscope

1985
Electrons emitted from thermionic, Schottky or field-emission cathodes are accelerated by a voltage of 0.1–50 keV between cathode and anode. The purpose of the electron optics of a SEM is to produce a small electron probe at the specimen by demagnifying the smallest virtual cross-section of the electron beam near the cathode.
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The electron microscope

Institution of Production Engineers Journal, 1953
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