Calculated Momentum Distributions and Compton Profiles of Interacting Conduction Electrons in Lithium and Sodium

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Abstract
The momentum distributions and Compton profiles of the conduction electrons in Li and Na are calculated considering effects of orthogonalization of the core electrons, periodic potential, and correlation. Using the orthogonalized-plane-wave method with parameters from Callaway and electron-gas data from an earlier calculation by Lundqvist, we find that the anisotropy of the Compton profile should be measurable for single crystalline Li but not for Na, and that the results compare well with recent experimental data for polycrystalline Li and Na. There is a slight indication of correlation effects beyond those considered here, but more accurate experimental data are needed for a more decisive conclusion.