Quadrupole Antishielding Factors of Ions

Values of the quadrupole antishielding factor γ_∞ have been calculated for the Mn²⁺, Fe³⁺, Ga³⁺, and Ag⁺ ions, using the method of direct solution of the inhomogeneous Schr\"odinger equation for the perturbed wave functions. For the Fe³⁺ ion, the present value of γ_∞ (=-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 Fe⁵⁷ᵐ as deduced from measurements using ferric compounds. The resulting value of Q(Fe⁵⁷ᵐ) is +0.28×{}10^-24 cm².