Gourt > Science > Methods and Techniques > Microscopy > Electron Microscopy
The electron microscope is a microscope that can magnify very small details with high resolving power due to the use of electrons as the source of illumination, magnifying at levels up to 2,000,000 times.
History
The first electron microscope was built by the German physicist Ernst Ruska. He knew that electrons possess a wave aspect, so he believed he could treat them in a fashion similar to light waves. Ruska was also aware that magnetic fields could manipulate electrons, possibly focusing them as optical lenses do to light. After confirming these principles through research, he set out to design an electron microscope. Ruska had deduced that an electron microscope would be much more powerful than an ordinary optical microscope, because he knew that resolution increased with shorter wavelengths. Since electron waves were shorter than ordinary light waves, it followed that they would allow for greater magnification. In 1933 Ruska and a collaborator, German physicist max knoll, under whom he obtained his doctorate, built the first crude electron microscope. Despite the fact that it was primitive and not fit for practical use, the instrument was still capable of magnifying objects 400 times. Ruska was later awarded the Nobel Prize in 1986 for its invention.
The first practical electron microscope was built by Eli Franklin Burton and students, Cecil Hall, James Hillier and Albert Prebus, at the University of Toronto, Canada in 1938.
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