Quadrupole antishielding factors for some3d5,4d5, and5d5ions

With the use of restricted numerical Hartree-Fock-Slater wave functions and the perturbation-numerical approach of Sternheimer, the ionic antishielding factor ${\gamma }_{\infty }$ has been calculated for the following three isoelectronic series of ions: ${\mathrm{Cr}}^{+}$, ${\mathrm{Mn}}^{2+}$, ${\mathrm{Fe}}^{3+}$, ${\mathrm{Co}}^{4+}$, ${\mathrm{Ni}}^{5+}$, ${\mathrm{Cu}}^{6+}$; ${\mathrm{Mo}}^{+}$, ${\mathrm{Tc}}^{2+}$, ${\mathrm{Ru}}^{3+}$, ${\mathrm{Rh}}^{4+}$, ${\mathrm{Pd}}^{5+}$, ${\mathrm{Ag}}^{6+}$; and ${\mathrm{W}}^{+}$, ${\mathrm{Re}}^{2+}$, ${\mathrm{Os}}^{3+}$, ${\mathrm{Ir}}^{4+}$, ${\mathrm{Pt}}^{5+}$, ${\mathrm{Au}}^{6+}$. For the ions of the first two series, ${\gamma }_{\infty }$ values have been correlated to their distance of outermost maximum in the total radial electron density distribution function. Also, it has been observed that within an isoelectronic series, ${\gamma }_{\infty }$ values can be satisfactorily represented in terms of a polynomial in ${\mathrm{Z}}^{-1\mathrm{}}$, the reciprocal of atomic number.