Abstract

Abstract Absolute atomic scattering factors have been, measured from a thin [110] aluminium crystal in transmission. Using Mo Kα radiation, with an incident divergence of a few minutes of are, the reflected and transmitted line profiles for varying mosaic distributions over the face of the crystal were examined. A correction for secondary extinction was made by increasing the diffracted intensity for each setting of the crystal by a measured ratio of the corresponding transmitted intensity when no diffraction is taking place to that during diffraction. Since the apparent atomic scattering factor was observed to be independent of reflection half-width, the effect of primary extinction is believed to be negligible. Imposing a measured secondary extinction correction that ranged from 5 to 13%, the atomic scattering factors thus obtained were in agreement with those previously reported on aluminium powder. These results, together with recent measurements on perfect Crystals of copper, indicate a significant d...

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