The UHV STM image was taken with an Omicron-Micro-STM and the SPM 1000 controller from RHK.
It shows a GaAs(001) surface with two different surface reconstructions in an area of 40x40 nm2: in the lower right part of the image a (2x6) reconstruction is seen with a zig-zag pattern of As dimer rows consisting of groups of 4 atoms. In the upper left part a (4x2) reconstruction is present with double rows of atoms which are resolved in the image.
Courtesy of R. Moosbuehler, Inst.fuer Exper. und Angew. Physik, Universitaet Regensburg
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