Electron Momentum Distribution in Titanium and the Renormalized-Free-Atom Model

The Compton profile of polycrystalline titanium has been measured using 59.54-keV $\gamma$ rays from a ${}_{}{}^{241}{}_{}{}^{}\mathrm{Am}$ source. The resulting Compton profile is significantly different from Weiss's previous measurements obtained form $\mathrm{Mo}K\alpha$ and $\mathrm{Ag}K\alpha$ radiation. Our experimental results have been interpreted by means of a renormalized-free-atom model. Good agreement between measured and computed quantities is found if the electronic configuration is chosen as $3d^{3}4s^1$ (in atomic notations), which is to be compared with the atomic configuration $3d^{2}4s^2$.