Autodetachment lifetime calculations of long-lived metastable states of Ba < sup> - and Eu < sup> -

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A calculation of the autodetachment energy width of the decay of the Ba- 5d6s6p 4F9/2 metastable state to the 6s2εh9/2 continuum predicts a lifetime for this state of 0.19 s. The Ba- calculation is used as a template for the more computationally intensive calculation of the analogous 4f75d6s6p J ≤ 8 metastable state of Eu-. This state is predicted to lie 11 797 cm-1 above the 4f76s2 Eu I ground state with a lifetime of 0.23 s. Opening of the 5p subshell in both cases and careful treatment of cancellation in the energy width calculations have been essential in obtaining these lifetimes. © 2005 IOP Publishing Ltd.

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Journal of Physics B: Atomic, Molecular and Optical Physics