= Electron energy loss spectroscopy
= EELS
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<Electron energy loss spectroscopy> measures the <energy> transferred from incident <electrons> to a specimen. A transmitted-electron spectrometer separates nearly unscattered electrons from electrons that excited collective modes, <atomic transitions> or core-level processes.
The zero-loss feature supplies an energy reference, and losses can be reported as $E_{\rm loss}=E_{\rm incident}-E_{\rm detected}$. Element-specific edges and their <energy-loss near-edge structure> constrain composition and bonding. A thicker specimen can produce several losses in one trajectory, so the recorded <electron energy loss spectroscopy> response need not equal a single-interaction response. <Electron energy-loss spectroscopy by JEOL>[JEOL EELS glossary: inelastic-scattering spectra and their information]{ref}
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