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="black"> Teoria cinematica </Font>(''It'') | ||
== Definition == | == Definition == | ||
| − | + | 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 these interaction into account. | |
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[[Category:X-rays]] | [[Category:X-rays]] | ||
Revision as of 15:44, 10 April 2008
Théorie cinématique (Fr). Teoria cinematica (It)
Definition
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 these interaction into account.