Transmission of a Gaussian scanning beam through circular, square, and slit apertures: Part I. Theory

D Shi1, M L Wolbarsht

  • 1Department of Biomedical Engineering, Duke University, Durham, NC 27706.

Health Physics
|December 1, 1990
PubMed

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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400 keV in...