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Sarah Turner




Electron Microscopes

The electron microscope was invented in 1931 by two Germans, Max Knoll and Ernst Ruska. In
general an electron microscope works by speeding up electrons in a vacuum until their wavelength is
only one hundred-thousandth of white light. Beams of the electrons are then focused on…

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Sarah Turner




The scanning coils move the focused beam across the specimen, back
and forth, row by row2.




Secondary electrons are knocked loose from the surface of the
specimen, as each electron beam hits a spot on it, and a detector
counts these electron and sends the signals to an…

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Sarah Turner









Sources
1
http://inventors.about.com/od/mstartinventions/a/microscope_2.htm
2
http://www.mos.org/sln/sem/
3
http://nobelprize.org/educational/physics/microscopes/tem/index.html

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