ELNES electron energy loss

ELNES Electron energy-Loss Near-Edge Structure Similar to NEXAFS, except monoenergetic high-energy electrons 60-300 KeV excite core-holes. 

ELNES electron (energy) loss near-edge spectroscopy... 

ELNES Electron energy loss near edge structure... 

Key words Electron energy loss spectroscopy, EELS, ELNES, TEM... 

Figure 2. Schematic representation of two models for the origin of electron energy-loss nearedge structures (ELNES) for the core-ionization edges, (a) Transition of strongly bound core electrons into unoccupied states (b) multiple scattering description of ELNES.

Electron Energy Loss Near-Edge Structure (ELNES)... 

Figure 7.26. Electron energy-loss spectroscopy (EELS) spectra. Shown (top) is a representative EELS spectrum of a nickel oxide sample. A typical EELS spectrum shows a zero-loss peak that represents the unscattered or elastically scattered electrons, the near-edge fine structure (ELNES), and extended energy-loss fine structure (EXELFS). Also shown (bottom) are the fingerprint regions of an EELS spectrum, just beyond the core-electron edges, which provide information regarding the detailed bonding and chemical environment of the desired element.

Tafto, J., and J. Zhu (1982). Electron energy-loss near edge structure (ELNES), a potential technique in the studies of local atomic arrangements. Ultramicro. 9, 349—54. 

The core loss structure in electron energy loss spectroscopy (EELS) is known to be very similar to XANES, because the core loss spectrum is caused by physically the same process as that of x-ray absorption, corresponding to the electronic transition from core level to unoccupied excited states. Therefore, the theoretical analysis for ELNES can be carried out by almost the same procedure used for that of XANES. For the chemical state analysis of oxide ceramics, ELNES has also been proved to be very efficient with theoretical analysis by DV-Xa cluster calculation . The cluster calculation indicates that the core-hole effect due to the electronic transition is sometimes very important and the ground state calculation gives a serious errors in excited electronic state. 

X-ray absorption near edge structure(XANES) and electron energy loss near edge structure(ELNES) show similar spectra, thus almost the same theoretical analysis is valid both for these spectroscopies. The careful analysis including higher excited atomic orbitals in the basis set reproduce very well the spectral structure even in details. The core-hole effects are sometimes very important in the excited state electronic state. The theoretical analysis by the cluster model calculation provides very useful information on the local electronic property and the micro structure. 

KEYWORDS transparent oxide conductors, chemical bondings, electron energy loss near edge structures (ELNES), indium oxides, oxygen vacancy... 

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