A Brief History of Electron Microscope

In the early part of the 1930’s, the German physicist, Ernst Ruska, employed at the Technical University of Berlin, put forward a proposal that microscopes, instead of using light, but electrons instead, could be used to provide a more detailed image of a subject. Considering that the resolution is dependent on the wavelength, the wavelength of the electron was calculated to be one-thousand times shorter than light. He demonstrated that a magnetic coil could act as a lens to translate and focus an electron beam, generated by an electron gun (tungsten filament) and with the help of an electrical engineer, by the name of Mark Knoll, they built the first electron microscope in 1933.

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