Ion induced Auger electron emission was investigated by measuring the polar angular distribution for the bulk-like shoulder in the Auger spectrum obeys the cosine law whilst that of the atomic-like peaks shows a spherical distribution, suggesting a model that the former Auger electrons are generated inside the sample and the latter from the sputtered atoms. This model was examined for Al-Mg alloy which showed the surface enrichment of Al. This surface enrichment clearly appears in the ion induced Auger spectrum.
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Yamauchi et al. (1985) studied this question.
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