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Crystalline effects in Auger electron spectroscopy
Author(s) -
Bishop H. E.,
Chornik B.,
Legressus C.,
Lemoel A.
Publication year - 1984
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740060304
Subject(s) - channelling , auger electron spectroscopy , auger , chemistry , auger effect , atomic physics , electron , ionization , low energy electron diffraction , electron spectroscopy , diffraction , electron diffraction , physics , optics , ion , nuclear physics , organic chemistry
The intensity of Auger emission is modified by the crystalline nature of the sample. One contribution to this effect is from the anistropic emission of the Auger electrons themselves but a second important contribution comes from changes in the surface ionization as a result of diffraction of the incident electron beam, (electron channelling). In practice the effects of anisotropic emission are often largely averaged out over the input aperture of the electron analyser but the contribution from electron channelling is not averaged and can be large. For instance there can be up to a three‐fold variation in the intensity of the KLL peak of aluminium when the incident beam is rotated ±5° about the [110] direction. Experimental measurements showing the magnitude of crystallographic effects in an Auger spectrometer (ESCALAB II, V.G.Scientific Ltd) are presented for polycrystalline copper and silver samples and for single crystals of aluminium and magnesium oxide. The channelling contrast can be explained qualitatively in terms of the two beam theory of electron diffraction but a multiple beam treatment is necessary to give a quantitative description of the effect.