LEADING CORRECTIONS TO ATOMIC IMPULSE-APPROXIMATION COMPTON PROFILES - A DENSITY-FUNCTIONAL APPROACH

By use of a theory due to Gasser, Tavard, and others, the leading firs t-order corrections to the spherically averaged atomic Compton profile s (CP's) beyond the impulse approximation, for some inert closed-shell monatomic systems (He, Ne, Ar, and Kr), are obtained. This is accompl ished by employing the Kohn-Sham technique of the density-functional t heory, which leads to a self-consistent description, as opposed to the popular ''effective-hydrogenic-potential'' theories used in this cont ext. The resulting corrections to the CP's thus obtained are seen to c ompare well with the earlier effective hydrogenic estimates. The orbit al corrections are seen to conform to an empirical rule put forth eali er by Gasser and Tavard [Phys. Rev. A 27,117 (1983)].