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The Cu(100)-c(2x2) N reconstructed surface has been studied by combined non-contact force and tunneling microscopy. Frequent tip changes produced all kinds of contrast in the interaction between the tip and differently reconstructed areas on the surface. Atomic resolution has been obtained using the tunneling current as feedback.
The atomic corrugation of alkali halides measured by non-contact force microscopy undergoes strong variations at low-coordinated sites like steps. We present experimental results on structured KBr surfaces and discuss the contrast mechanisms. Chemical sensitivity of the atomic corrugation is demonstrated for a mixed alkali halide crystal.
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