The presence of two metastable states in the negative beryllium ion, and , which are connected by an optical transition, offers a unique possibility for gaining new information about this ion. Utilizing resonant, two-photon detachment, combined with resonant-ionization detection of the resulting neutral atoms, we have obtained results yielding the lifetimes of the ( ) and ( ) levels, the fine-structure splittings of the levels, and an improved transition wavelength.
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Andersen et al. (1996) studied this question.
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