Ordered Dimer Structures and Defects on Si(001) Studied by High Resolution Helium Atom Scattering
On the Si(001) surface many different structural phases have been reported. These include features with (2×1), c(4×2), c(2×2) unit cells as well as (2×n) structures, where 6≤n≤l0. The simplest of these is the (2×1) :periodicity which arises from the pairing of dangling bonds at the surface and the formation of dimers in the outermost surface layer. This simple picture is complicated by distortions in the underlying lattice that take up some of the strain introduced by the dimer bonding. As a result the reconstruction extends several layers into the bulk: so that it is difficult to deduce the precise geometry using conventional surface structural probes.
KeywordsNickel Helium Auger
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