Hyperfine-dependent lifetimes in Be-like ions

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M. Andersson, Y. Zou, and R. Hutton
The Key Laboratory of Applied Ion Beam Physics, Ministry of Education, People's Republic of China and Shanghai EBIT Laboratory, Institute of Modern Physics, Fudan University, Shanghai, People's Republic of China

T. Brage
Department of Physics, Lund University, Sweden

Received 15 December 2008; published 3 March 2009

Theoreticalinvestigations of hyperfine quenching of the two metastable levels 1s²2s2p ³P₀and ³P₂ have been performed along the Be-like isoelectronic sequencefor ions between Z=6–22. It is shown that the lifetimeof the latter level is sensitive to hyperfine quenching inthe beginning of the isoelectronic sequence, but the sensitivity decreasestowards the high-Z end. It is also shown that thehyperfine dependent branching fraction between the 2s² ¹S₀–2s2p ³P₂ and the 2s2p ³P₁–2s2p ³P₂transitions can lead to some rather drastic changes in thespectra. Our predicted value of 0.677 s⁻¹ for the hyperfine-induced 2s² ¹S₀–2s2p ³P₀transition rate for ⁴⁷Ti¹⁸⁺ are in disagreement with a recentexperimental value of 0.56(3) s⁻¹. Our calculated values of this quenchingare in agreement with other recent calculations all along thesequence.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.79.032501
DOI:	10.1103/PhysRevA.79.032501
PACS:	31.10.+z; 31.15.A-; 32.10.Fn; 32.70.Cs 31.10.+z Theory of electronic structure, electronic transitions, and chemical binding in atoms and molecules 31.15.A- Ab initio calculations (atoms and molecules) 32.10.Fn Atomic fine and hyperfine structure 32.70.Cs Atomic oscillator strengths, lifetimes, transition moments YEAR: 2009
KEYWORDS:	hyperfine structure, isoelectronic series, metastable states, positive ions, radiative lifetimes

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