Abstract
Positron annihilation induced Auger electron spectroscopy (PAES) makes use of electron-positron annihilation to create core holes which result in Auger electron emission. This excitation process provides PAES with significantly higher surface selectivity than conventional Auger techniques. To date, PAES measurements have been reported on 5 elements. In this paper we report the first positron annihilation measurements of Pd and Au along with measurements of Cu and Fe. Analysis of the data indicates that the intensities of the low energy Auger signals of Cu, Fe, Pd, and Au are in the proportion of 1.00:0.57:1.35:1.17. These measurements should be useful in providing elemental standards for investigations of epitaxial growth and/or intermixing in bimetallic systems. The measured intensities are compared to calculations for core annihilation probabilities. In addition, measurements which demonstrate the sensitivity of PAES to H 2 chemisorption on Pd are presented.
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