Multiconfigurational Hartree-Fock calculations of the hyperfine structure constants for the 1s22s 2S and 1s22p 2P states of 7Li and 9Be+

Hyperfine structure constants are precisely calculated for the 1s22s 2S1/2 and 1s22p 2P1/2,3/2 states of the 7Li atom and the 9Be+ ion. To describe accurately the core polarization, which is important for the hyperfine structure, wave functions are generated with a large-scale multiconfigurational Hartree-Fock method. Corrections due to the finite nuclear mass and size, the relativistic effect, and the quantum electrodynamics (QED) effect are considered. The effect of the finite nuclear size includes that of the nuclear magnetization structure (Bohr-Weisskopf effect). The corrected values of the magnetic dipole and the electric quadruple hyperfine structure constants of 7Li are determined to be A1/2 = 401.7033(790) MHz for the 2S1/2 state, and A1/2 = 45.98429(715) MHz, A3/2 = -3.13482(55) MHz, and B3/2 = -0.208395(10) MHz for the 2P1/2,3/2 states. The corresponding values for 9Be+ are A1/2 = -625.0608(1720) MHz, and A1/2 = -117.9819(247) MHz, A3/2 = -0.9381(18) MHz, and B3/2 2.26490(14) MHz. The present result shows a satisfactory agreement with experiments. (author)