Atomic quadrupole moments of Al and In

The atomic quadrupole shielding factor $R_{\Theta }$ has been calculated for ${}_{}{}^2{}_{}{}^{}P_{\frac{3}{2}}^{}{}_{}{}^{}$ ground states of Al and In using the Sternheimer uncoupled perturbation numerical approach and Hartree-Fock-Slater wave functions. The calculated values of $R_{\Theta }\left(\mathrm{Al}\right)=0.134\mathrm{}$ and $R_{\Theta } \left(\mathrm{In}\right)=0.098\mathrm{}$ are in good agreement with the available experimental estimates of 0.096±0.053 and 0.114±0.030, respectively.