Difference between revisions of "Kinematical theory"

From Online Dictionary of Crystallography

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<font color="blue">Théorie cinématique</font> (''Fr'').<Font color="black"> Teoria cinematica </Font>(''It'')
<font color="blue">Théorie cinématique</font> (''Fr''); <Font color="red">Kinematische theorie</Font> (''Ge'');  <Font color="green">Teoría cinemática</Font> (''Sp''); <Font color="black">Teoria cinematica</Font> (''It'');  <Font color="brown">Кинематические теория</Font> (''Ru''); <Font color="purple">運動学的回折理論</Font> (''Ja'').
== Definition ==
== Definition ==

Revision as of 12:19, 3 February 2017

Théorie cinématique (Fr); Kinematische theorie (Ge); Teoría cinemática (Sp); Teoria cinematica (It); Кинематические теория (Ru); 運動学的回折理論 (Ja).


In the kinematical or geometrical theory, the amplitudes diffracted by a three-dimensional periodic assembly of atoms (Laue) or by a stack of planes (Darwin) is derived by adding the amplitudes of the waves diffracted by each atom or by each plane, simply taking into account the optical path differences between them, but neglecting the interaction of the propagating waves and matter. This approximation is not compatible with the law of conservation of energy and is only valid for very small or highly imperfect crystals. The purpose of the dynamical theory is to take this interaction into account.