Landolt-Börnstein - Group III Condensed Matter Truncation Rod Scattering (TRS)


This chapter discusses truncation rod scattering (TRS) of surface structure. It has been pointed out recently that the surface of a crystal can be viewed as a sharp interruption of three-dimensional periodicity along one dimension, and that, as such, is the origin of extra scattering. Experiments performed on a variety of crystal surfaces provide indeed experimental verification of scattering mechanism. This chapter particularly illustrates TRS from the (111) face of a platinum crystal. The model of a surface with a certain degree of roughness is characterized by a parameter β which is defined as the ratio between the occupancies of two successive added layers of atoms on top of the substrate perfect crystal, in which all atomic sites are occupied. It appears that truncation rod scattering may be used as a sensitive probe for characterizing surface roughness. It should be pointed out that the 1/q2 dependence can be obtained by considering the limiting form of dynamical theory far from Bragg reflections. One way to understand the rod-like shape of diffuse scattering around a node in reciprocal space is to view it as the consequence of different scanning schemes. Rod-like scattering (or TRS) is observable even in the idealized case of a perfect crystal in which there is no reconstruction, the lattice constants at the surface are identical to those in the bulk, and the surface is atomically flat, with no roughness whatsoever.

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Title Truncation Rod Scattering (TRS)
Book Title
Interaction of Radiation with Surfaces and Electron Tunneling
8.3.1 Introduction
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Landolt-Börnstein - Group III Condensed Matter
  • G. Chiarotti
  • Authors
  • R. Colella
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