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During the last decade, surface research has clearly shifted its
interest from the macroscopic to the microscopic scale; a wealth of
novel experimental techniques and theoretical methods have been
applied and developed successfully. The Topics volume at hand gives
an account of this tendency. For the understanding of surface
phenomena and their exploitation in tech nical applications, the
theoretical and experimental analysis at the microscopic level is
of particular interest. In heterogeneous catalysis, for example, a
chemical reaction takes place at the interface of two phases, and
the process occurring at the surface is composed of a sequence of
individual microscopic steps. These individual steps include
adsorption, desorption, surface diffusion, and reaction on the
surface. These elementary steps are greatly influenced by the
structure and the dynamics of the surface region. Especially the
catalytic activity may strongly depend on the structure of the
catalyst's surface. The necessity of per forming surface
investigations on a microscopic scale is also reflected clearly in
research work relating to metal-semiconductor interfaces which
determine es sentially the properties of electronic device
materials. The experimental probe on the atomic scale, coupled with
parallel theoretical calculations, showed that the electronic
properties of a metal-semiconductor interface strongly depend on
the crystallographic structure of the semiconductor; in particular,
it is im portant to know in this context the modification of the
atomic arrangement in the surface region caused by the termination
of the crystal by the surface."
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