Expansion coefficients and moments of electron momentum densities for singly charged ions

Numerical Hartree-Fock calculations of the first three coefficients of the MacLaurin expansion and the leading coefficient of the large-p asymptotic e xpansion of the electron momentum densities Pi(p) are reported for 54 singl y charged atomic cations fi-om He+ (atomic number Z = 2) to Cs+ (Z = 55) an d 43 anions from. H- (Z = 1) to I- (Z = 53) in their experimental ground st ates. We also report all the finite moments [p(k)] (-2 less than or equal t o k less than or equal to +4) of the momentum densities Pi(p) for the above -mentioned 97 ionic species. The results are compared with the previous one s for neutral atoms [Koga and Thakkar (1996) J Phys B 29: 2973], and the de pendence of the expansion coefficients and moments on nuclear charge is dis cussed among isoelectronic species.