Hyperfine-Structure Calculations for Atoms with the(4p)NGround-State Configuration

The magnetic dipole and electric quadrupole hyperfine constants have been calculated for the ${}_{}{}^2{}_{}{}^{}P_{\frac{3}{2}}^{}{}_{}{}^{}$ and ${}_{}{}^2{}_{}{}^{}P_{\frac{1}{2}}^{}{}_{}{}^{}$ states of gallium and bromine and the ${}_{}{}^3{}_{}{}^{}P_2^{}{}_{}{}^{}$ and ${}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{}$ states of germanium and selenium, using unrestricted and projected unrestricted Hartree-Fock wave functions to include the polarization of closed-shell effects, and relativistic Hartree-Fock-Slater wave functions to evaluate relativistic effects. The results indicate that both kinds of effects are important. The Landé factors $g_J$ have also been calculated (Breit-Margenau effect).