Abstract

Energies and radiative transition probabilities have been computed for the 5s2 1S0–5s5p1,3PJ intervals in highly ionized members of the 62 electron samarium isoelectronic sequence by using ab initio multiconfiguration Dirac–Fock methods. For Z > 74 these become the lowest-lying levels, and the ion assumes an alkaline earthlike structure. Excitation energies and E1, M1, E2, and M2 transition probabilities for the 5s5p levels are reported for the ions Re+13 through U+30. Isoelectronic trends in the relative spacings of the 5s5p levels were also investigated by using semiempirical screening parameterizations of the intermediate coupling equations for the spin–orbit and exchange energies. These trends are compared with systematic regularities noted earlier in the homologous Be, Mg, Zn, and Cd sequences, and possibilities for precise extrapolative predictions are examined.

© 1986 Optical Society of America

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