Quadrupole Antishielding Factors of Ions

Values of the quadrupole antishielding factor ${\gamma }_{\infty }$ have been calculated for the ${\mathrm{Mn}}^{2+}$, ${\mathrm{Fe}}^{3+}$, ${\mathrm{Ga}}^{3+}$, and ${\mathrm{Ag}}^{+}$ ions, using the method of direct solution of the inhomogeneous Schrödinger equation for the perturbed wave functions. For the ${\mathrm{Fe}}^{3+}$ ion, the present value of ${\gamma }_{\infty }$ (=-9.14) is appreciably larger in magnitude than that previously obtained by Burns and Wikner, resulting in a decrease of the calculated quadrupole moment of ${\mathrm{Fe}}^{57m}$ as deduced from measurements using ferric compounds. The resulting value of $Q\left({\mathrm{Fe}}^{57m}\right)$ is +0.28×${10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$.