2014 La spectrométrie des électrons Auger permet de caractériser les atomes situés à la surface d'un corps cristallin ou amorphe et de préciser la nature de leurs liaisons. Dans le cas de monocristaux elle est en général associée à la diffraction des électrons lents, ce qui permet d'avoir, en plus, des renseignements sur la structure de la surface.Après un rappel de la désexcitation non radiative des atomes et des transitions Auger correspondantes, les problèmes que soulève l'interprétation des spectres d'énergie sont traités d'abord dans le cas d'un atome isolé puis dans celui d'un atome lié à des atomes voisins de même espèce ou d'espèces différentes.On examine enfin quelques applications de l'analyse Auger. Abstract. 2014 Auger electron spectroscopy (A. E. S.) allows to characterize the atoms lying at surfaces of amorphous and crystalline materials and to investigate their chemical bond. In the case of single crystals it is generally associated with LEED which gives information on the surface structure.After having recalled some principles about radiationless deexcitation of atoms and the related Auger transitions we discuss the (problems of) interpretation of energy spectra in the case of a single atom and their of an atom bound to neighbours either of the same kind or of a different one. Some applications of A. E. S. as an analytical method are finally described.
The control of the concentration of Zn and its fluctuation in the high pressure Bridgman grown CdZnTe crystals is part of our characterization work on the ternary grown ingots grown in house. In order to reach both high sensitivity and high position resolution, we have developed a new system consisting of a X-ray generator, coupled to a focusing X-ray capillary, delivering intense beams in the micron scale, since the intensity gain is around a factor of 100 compared to conventional methods.The characteristic X-rays are measured through a high resolution CdZnTe detector (225 eV at 5.9 keV FWHM) cooled by a Peltier system. The results of our investigations on different kinds of crystals will be discussed.
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