Electron Energy-Loss Spectroscopy of Carbon Nanotubes and Onions
In electron energy-loss spectroscopy (EELS), the kinetic energy of a beam of initially monokinetic electrons after interaction with a sample is analyzed. This can be in transmission geometry, where electrons pass through a sufficiently thin film, or in reflection geometry, combination with a transmission electron microscope (TEM), where one precisely has the transmission geometry described above. This configuration has the advantage that high-resolution spatial information can readily be combined with spectroscopic data. In principle, there are two variations of the technique—either (1) the electron beam where electrons incident at a gracing angle are reflected back into an energy analyzer. Most often, EELS is carried out in is focused to a subnanometer spot that is scanned across the sample while at each point the spectroscopic information is recorded or (2) electrons within given energy windows are used to form a series of energy filtered images of the sample .
KeywordsCarbon Nanotubes Core Loss Dielectric Tensor Plasmon Excitation Electron Energy Loss Spectrum
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