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This is a STM image of a Pt
surface. Vacancies are clearly visible |
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Next we see the clean {111} Si surface in ultra
high vacuum conditions (otherwise the surface would immediately oxidize and we
would see amorphous SiO2). |
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The {111} surface looks not as one would expect from a
straight model - it has "reconstructed". This means that the surface
layer formed a two-dimensional crystal that is totally different from the
fcc Si lattice (it has a so-called 7 × 7 symmetry).
Still, point defects are clearly visible. |
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These fantastic pictures are all over the
world. I do not know whom I should acknowledge, sorry. |
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© H. Föll (Defects - Script)
4.2.1 Point Defects in Non-Equilibrium 
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