How Does an Electron Microscope Work?

Answer

Electron Microscopes (EMs) function exactly as their optical counterparts except that they use a focused beam of electrons instead of light to 'image' the specimen and gain information as to its structure and composition. A stream of electrons is formed and accelerated toward the specimen using a positive electrical potential. The stream is confined and focused using metal apertures and magnetic lenses into a thin, focused, monochromatic beam. Interactions occur inside the irradiated sample, affecting the electron beam.
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How Does an Electron Microscope Work?
Electron microscopes can generally be found in two variations. A transmission electron microscope (TEM) is solely capable of producing two-dimensional images. A scanning electron microscope (SEM), on the other hand, can produce high-resolution... More »
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An electron microscope works by using a beam of extremely energetic electrons. In doing so, an electron microscope is able to closely examine specimen on a very fine scale. You can find more information here: http://www.unl.edu/CMRAcfem/em.htm
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