Measurements have been made of the absolute x-ray scattering factors for the first three reflections---(111), (200), and (220)---in aluminum, in symmetrical transmission on a powder sample. Monochromatized Mo Kα radiation was applied. The form factors obtained were significantly less than the theoretical Hartree-Fock free-atom values, and even lower than the values calculated for the ten neon-core electrons. These findings were in agreement with previous measurements on powders, and on an imperfect single crystal in transmission. Qualitatively, the x-ray diffraction data correspond to the results of Compton-scattering measurements, which suggest that the momentum density for the aluminum core is more extended in momentum space than that for the Hartree-Fock free-atom calculation.
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Järvinen et al. (1969) studied this question.
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