Abstract
This article presents some theoretical studies related to a general problem of interpretation of scanning tunneling microscopy (STM) results. More specifically, we have investigated the influence of electronic properties of a tip as well as its geometry on the multichannel tunneling of electrons in a tip-sample system. In particular, we have discussed how the electronic and atomic structure of different tips could change the topography of STM images. This problem has been considered in detail for STM images of a single Xe atom adsorbed on an A1(001) surface as well as for those of a clean A1(001) surface; our calculations have been performed for Al and Ni tips of a different geometry.
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