Abstract
Scanning tunneling microscopy and $dI/dV$ mapping reveal three types of interference patterns on Ag(100) and Ag(111) after implantation of argon or neon. These patterns originate from the scattering of bulk electrons between subsurface impurities and the surface. Above nanocavities, the interference pattern develop a rich internal structure. Above point impurities, two types of simpler patterns develop that differ in corrugation, shape, and energy dependence. Low corrugated patterns show a strong dependence on energy, while more corrugated patterns hardly vary with energy. In addition, only the high corrugated patterns reflect the symmetry of the surfaces, while the low corrugated patterns are circular.
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