Abstract
We have observed edge diffraction with a double crystal diffractometer and therefore can explain the enhanced wing intensity of measured Darwin profiles in dynamical diffraction. Precise experiments uniquely demonstrate the contribution of Fresnel diffraction at absorbing straight edges, interpreted as ultra small angle scattering (USAS) or diffuse scattering in other experiments. No contributions were found due to ultra small surface scattering or TDS stemming from the crystals, which was proposed by other groups to explain the enhanced wing intensity of their measured rocking curves.
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