Abstract
Analyses of interatomic and valence Auger transitions have been applied to study the surface composition of W based impregnated cathodes. Results show generally a good agreement between calculations based on a linear combination of various calibrated surface components and actual experimental values. Beside Auger peak height analyses, shifts in Auger energy of the interatomic transitions were also used to characterize changes in surface chemistry. Surface compositional changes are illustrated during: Thermal activation; variations in surface composition due to high temperature operation; adlayer depletion due to sputtering; changes occurring during adsorption as well as desorption of gases such as H 2O, O 2 and CO 2.
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