Scanning Microscopy


We have developed a generally applicable, semi-empirical approach for quantitatively interpreting Auger line shapes. Detailed information on hybridization, electron delocalization and correlation, screening effects, bonding, and covalency can be obtained from the line shape. Methods for extracting the Auger line shape from the experimental data are briefly described. We summarize our recent results from the C KVV Auger line shapes of five different gas phase hydrocarbons (methane, ethane, cyclo-hexane, benzene, and ethylene), three solids (polyethylene, diamond, and graphite), and a molecularly chemisorbed system (ethylene/ Ni). The normal kvv component accounts for only about half of the total experimental KVV intensity for the hydrocarbon gases; much larger fractions for the three solids. The remaining part of the experimental line shape can be attributed to satellites resulting from resonant excitation or dynamic screening processes. The normal kvv component line shapes are seen to reflect delocalized holes, however correlation effects are very evident. Although these screening and correlation effects complicate the interpretation of the line shapes, they indeed cause the chemical effects seen in the experimental line shapes.

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