The most important symmetry properties of the incommensurately
modulated crystal structures are investigated by use of exact
symmetry theory of quasi-one-dimensional systems in the framework of
group theory. It is shown that typical characteristic formulae
developed for the description of scattering cross sections of
one-dimensionally modulated crystals can be directly derived by the
line-group technique. A symmetry analysis of static soliton
structures is performed, representing a new method for the
investigation of elementary excitations of crystals modulated
incommensurately. It leads to the description of symmetry breaking,
to the selection rules and hints at the similarity of symmetry
behaviour of static and dynamic solitons. The actual formulae for
Debye-Waller factors in the case of incommensurately modulated
crystals are calculated and tabulated by using generating elements
of the line groups concerned.
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