From molecular electron density to electron momentum density

The scope of the quasiclassical procedure previously used by us for estimating atomic-electron momentum densities exclusively from the knowledge of electron densities has been extended to diatomic molecules. This procedure yields a spherically averaged molecular-electron momentum density from which the corresponding Compton profile and $〈p^n〉$ expectation values may be computed. The procedure has been tested for the molecules ${\mathrm{H}}_2$ and ${\mathrm{N}}_2$. The Compton profiles and $〈p^n〉$ values thus obtained compare well with their wave-function and experimental counterparts.