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Quantum Mechanical effect of transitioning to a classically forbidden energy state.

One of the most popular applications is in electron-tunneling microscopes that are used to see objects that are too small to see using conventional microscopes. Electron tunneling microscopes overcome the limiting effects conventional microscopes (optical abherrations, wavelength limitations) by scanning the surface of an object with electrons.

See also Quantum Mechanics.

~cmjr - just to get started