Poendel Loesung
Poendel Loesung
If two-beam dynamical diffraction is assumed, when one diffracted wave is strongly excited, the energy of the incident wave is completely transferred to the diffracted wave at a thickness of half the extinction distance. When the wave travels another half the extinction distance, the energy of the diffracted wave is completely transferred to the incident wave again. This phenomenon is called "Poendel Loesung." Thus in electron diffraction, the intensity of the diffracted wave is not proportional to the scattering amplitude of the reflection, but periodically changes with specimen thickness.
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