Quadrupole antishielding factors for actinide ions

Perturbation-numerical calculations have been performed using nonrelativistic Hartree-Fock-Slater wave functions to obtain the Sternheimer quadrupole antishielding factor ${\gamma }_{\infty }$ for all the tetrapositive ions in the actinide series ($90\le Z\le 103$). For these ions, the nonrelativistic ${\gamma }_{\infty }$ values seem to be constant at ∼-95. It is estimated that the relativistic effects would increase the $\left|{\gamma }_{\infty }\right|$ value by ∼ 65%.