Description:

Atomically flat gold films (left picture, 0.25 mm) are grown on cleaved mica and evaporation under elevated temperatures. On these flat gold films, clusters can be deposited.  Scanning Tunneling Spectroscopy enables us to investigate the electronic properties of these deposited clusters.  On micrometer scale, the gold forms large islands, separated by trenches (hundreds of nanometers deep).  When zooming in to nanometer scales on top of an island, we can see that the gold is atomically flat: atomic steps of 0.235 nm are visible in this image.
 

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