Electron momentum distributions in graphite and diamond and carbon-carbon bonding

Abstract
A new measurement of the Compton profile of graphite is reported. These results, along with previously reported results for diamond, are compared with pseudopotential- and localized-bond-model calculations of the Compton profile. Qualitative but not quantitative agreement with experiment is obtained. We conclude that better band calculations are needed to achieve quantitative agreement and that a localized-bond model is reasonable for graphite.