kinematical diffraction
kinematical diffraction
An electron that passes through a crystalline specimen is reflected (diffracted) by lattice planes satisfying a Bragg condition. The kinematical diffraction approximation assumes that the Bragg reflection occurs only one time in the specimen. In this context, the reflection intensity is proportional to the square of the crystal structure factor of the reflection. This approximation holds only when a specimen is thin enough (<3 nm). As a specimen is thicker, the reflection occurs many times. In this case, the dynamical diffraction theory must be applied to the interpretation of reflection intensities and electron microscope images.
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