[Color-Images with the Scanning Tunneling Microscope
] A Scanning Tunneling Micoscope (STM) in principle shows the topography of the sample being scanned, down to atomic dimensions. But this description is only a good appoximation, in reality the electronic structure of the sample plays an important role in the imaging process. This fact can be used to obtain STM- images in color, with these images not only being very aesthetical, but with the color variations representing varying electronic structures of the sample surface.
Surface of a 10 monolayer thick island of Tb on W(110). The green region is the clean Tb(0001) surface, while the blue-violet region is an adsorbate induced reconstruction of the Tb(0001) surface. The adsorbates, possibly CO, result from impurities from the evaporant, since the degassing (cleaning) process of the Tb evaporation-source had not been finished as this sample was prepared.
120 nm x 120 nm
three constant current topographical images at:
red = 0.3 V
green = 1 V
blue = 1.8 V