Quantitative characterization of abrupt interfaces by angle-resolved Auger electron emission

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Abstract
We have used the Ag/Pd(001) interface as a test case for the application of polar-angle–resolved Auger emission and related modeling to interdiffusion studies. This interface is shown to be abrupt and epitaxial, thereby providing a sharp junction with materials of known density on either side. Model calculations generate Ag and Pd density functions which terminate abruptly at the interface, and the calculated Ag density is within 10% of the bulk Ag value for all but the thinnest overlayers (one to four monolayers). For ultrathin overlayers, the model (which treats the overlayer as a continuum) breaks down and generates physically unreasonable Ag density functions.