Tunneling electron microscope
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A scanning tunneling microscope (STM) is an instrument that can image surfaces at the atomic level, invented in 1981.
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Mentioned once in Selling Out.
Selling Out
Season 1 · Episode 9 · S01E09
“at Cornell University they have an incredible piece of scientific equipment known as the tunneling electron microscope. Now, this microscope is so powerful that by firing electrons you can actually see images of the atom”