The Electron energy loss spectroscopy reference article from the English Wikipedia on 24-Apr-2004
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Electron energy loss spectroscopy

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In electron energy loss spectroscopy a material is exposed to a beam of electrons with a known kinetic energy. Some of the electrons will lose energy in the collision process. Their kinetic energy is analysed and a spectrum constructed. The spectrum contains a.o. information on the vibrational states of the specimen.

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