MULTICONFIGURATIONAL HARTREE-FOCK CALCULATIONS OF HYPERFINE-INDUCED TRANSITIONS IN HELIUM-LIKE IONS

We are investigating the hyperfine quenching of 1s2p 3P0o for the three heliumlike ions F7+19, Na9+23, and Al11+27 in the multiconfigurational Hartree-Fock-Breit-Pauli scheme. The configuration expansions are generated with the active-space method and are increased in a systematic way, allowing the convergence of the calculated parameters to be studied. A careful comparison is done with the pioneering work of Mohr using a perturbation approach [Beam-Foil Spectroscopy, Atomic Structure and Lifetimes, edited by I. Sellin and D. Pegg (Plenum, New York, 1976), Vol. 1, pp. 97-103]. In the present calculations the orbital and spin-dipole magnetic contributions, which were previously neglected, are added to the dominant Fermi contact interaction term and a detailed analysis of the hyperfine induced transition rate is done in order to learn how to get an accurate description of the property in the multiconfiguration Hartree-Fock-Breit-Pauli approximation. © 1995 The American Physical Society.