Analysis and Interpretation of X-Ray Compton Profiles in Diamond

Recent measurements by Weiss and Phillips of the Compton profile in a diamond single crystal have been reanalyzed, using an inversion method. The resulting electron momentum density does not show a deficiency of density along the $〈211〉$ directions, as was concluded by Weiss and Phillips, but rather along the $〈110〉$ directions. Maxima are found along the $〈100〉$ and $〈111〉$ directions. The results are interpreted in terms of filled valence electron states inside the Jones zone, formed by the set of {220} planes, and empty states outside this zone.