Dynamical theory of diffraction: Difference between revisions

Revision as of 21:18, 19 July 2006

Revision as of 00:22, 9 August 2006

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* The '''extinction length''' is related to the ''[[Pendellösung]]'' period. Even if a crystal is infinitely thick, only the crystal volume within the extinction length contributes considerably to the diffraction in [[Bragg geometry]].

* In [[Laue geometry]], beam paths lie within the [[Borrmann triangle]]. [[Kato fringes]] are the intensity patterns due to ''[[Pendellösung]]'' effects at the exit surcacesurface of the crystal.

* [[Anomaleous absorption]] effects take place due to a [[standing wave]] patterns of two wave fields. Absorption is stronger if the standing wave has its anti-nodes on the lattice planes, i.e. where the absorbing atoms are, and weaker, if the anti-nodes are shifted between the planes. The standing wave shifts from one condition to the other on each side of the [[Darwin plateau]] which gives the latter an asymmetric shape.