Direct measurement of the wave function ͑or at least the modulus squared of the wave function, the spectral function͒ is an important goal in electron spectroscopy. This requires a state-selective ͑i.e., energy resolved͒ measurement of the momentum density in all of momentum space, not just the reduced Brillouin zone. Photoemission has been used very successfully to measure dispersion, mainly in the reduced zone scheme. Compton measurements determine a projection of the momentum density in the full momentum s…
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