Abstract
In general, the absence of matrix effects in low-energy ion scattering makes quantification possible. Ion fractions, important in quantification, are obtained by measuring scattered ion yields as a function of primary energy. Differences in ion fraction and final energy (strong matrix effect) are observed in 1–3.5 keV He+ scattering from graphitic and carbidic carbon on a polycrystalline rhenium ribbon. These results are explained by a special quasi-resonance neutralization for graphite because of the large width of the sp band of graphite, extending towards the He 1s energy level.
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