The Compton profile of polycrystalline titanium has been measured at Mo Kα (λ=0.709 {}). The valence-electron momentum density evidences significant $4s$ character, and the discontinuity in momentum density associated with the Fermi surface is at 1.08 ±{} 0.06 a.u. compared with the free-electron value of 1.01 a.u. for four electrons per atom. Band-momentum wave functions are unavailable for comparison with theory.
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R. J. Weiss (1970) studied this question.
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