Electron energy loss spectroscopy

 

In electron energy loss spectroscopy (EELS) a material is exposed to a beam of electrons with a known, narrow range of kinetic energies. Some of the electrons will undergo inelastic scattering, which means that they lose energy and have their paths slightly and randomly deflected. The amount of energy loss can be measured via an electron spectrometer and interpreted in terms of what caused the energy loss. Inelastic interactions include phonon excitations, inter and intra band transitions, plasmon excitations, inner shell ionizations, and ?Erenkov radiation. The inner-shell ionizations are particularly useful for detecting the elemental components of a material. For example, one might find that a larger-than-expected number of electrons comes through the material with 285 ev (electron volts, a unit of energy) less energy than they had when they entered the material. It so happens that this is about the amount of energy needed to remove an inner-shell electron from a carbon atom. This can be taken as evidence that there's a significant amount of carbon in the part of the material that's being hit by the electron beam. With some care, and looking at a wide range of energy losses, one can determine the types of atoms, and the numbers of atoms of each type, being struck by the beam. The scattering angle (that is, the amount that the electron's path is deflected) can also be measured, giving information about the dispersion relation of whatever material excitation caused the inelastic scattering.

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A technique in which inelastic interactions of an electron beam with atoms in a sample results in an electron energy distribution spectrum, from which compositional and chemical bonding information can be extracted.

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Electron energy loss spectroscopy analyses the inelastically scattered electrons present in the beam of a TEM after it has been transmitted through the sample. The spectra can be used to obtain information about the chemical composition and electronic structure of the sample.

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A technique based on electron energy loss very sensitive for characterizing the graphite structure.

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Method in which the energy distribution spectrum of electrons inelastically scattered as they pass through a material is used to determine compositional and structural information about the material

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Method in which the energy distribution spectrum of electrons inelastically scattered as they pass through a material is used to determine compositional and structural information about the material

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Technique where inelastic interaction of an electron beam with atoms in a sample results in an energy distribution spectrum that contains compositional and chemical bonding information

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