Topological Correlations in a Layer Adsorbed on a Crystal Surface
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Date
1990Author
Wojtczak, L.
Zasada, Ilona
Bosse Le, J. C.
Lopez, J.
Rousseau, J.
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The incoherent scattering of electrons by a layer adsorbed at a single crystal surface is
determined by the topological correlations of elements forming the adsorbed layer. The model for the
description of atoms or molecules adsorbed on the surface is formulated in terms of occupation
operators which are expressed in terms of pseudospin operators with a given spin value. The
correlations can be determined by the fluctuation dissipation theorem in connection with the
susceptibility or given directly by means of the Green functions properly chosen. An example of the
topological or chemical disorder of two components is considered in detail. The calculations of the
topological correlations allow us to find the incoherent scattering amplitude as a function of the
surface coverage which can be experimentally detected.
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