X-ray Compton scattering measurements on single crystals of aluminium indicate that the electron momentum distribution at low momenta (<2 atomic units) shows considerable deviation from the free electron gas plus free atom core model, in agreement with recent γ-ray Compton scattering measurements. The experimental results show an excess of momentum above the Fermi surface. Better agreement is obtained with the model of Pandey and Lam which includes electron-electron correlation and core orthogonalization effects, but a small discrepancy remains. No evidence of crystalline anisotropy was found in the results obtained from crystals with [110] and [111] scattering vector orientations.
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Cooper et al. (1974) studied this question.
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