Lifetimes and branching ratios of excited states in La < sup> - , Os < sup> - , Lu < sup> - , Lr < sup> - , and Pr < sup> -

Document Type

Article

Publication Date

3-5-2010

Abstract

Relativistic configuration-interaction calculations have been performed for all possible E1, M1, and E2 transitions between bound anion states of La - and Os-. We pay particular attention to E1 transitions in each case that may be of use in laser cooling of these anions. Although the La- transition energy is approximately one-third of the Os - transition, our results indicate that the Einstein A coefficient is nearly two orders of magnitude larger, which would lead to more efficient laser cooling. We have also explored long-lived opposite-parity excited states in Lu- and Lr- which are restricted to M2 decay by selection rules. Finally, in Pr-, we find sufficient mixing between a weakly bound excited 4f25d26s2 state with a nearby 4f36s26p resonance to result in a lifetime similar to that of the other excited anion states, despite the fact that the dominant configurations of these M1 and E2 transitions differ by two electrons. © 2010 The American Physical Society.

Publication Title

Physical Review A - Atomic, Molecular, and Optical Physics

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