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- Henderson, M, et al.
(author)
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Lifetime measurements for ground term transitions in TaII, WII, and ReII
- 1999
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In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 520:2, s. 805-810
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Journal article (peer-reviewed)abstract
- Lifetime measurements have been made for the radiation emitted in the ground term transitions of the nominal form 5s(2)5p(6)5d(x)6s-5s(2)5p(6)5d(x)6p in Ta II (x = 3), W II (x = 4), and Re II (x = 5). Supporting theoretical calculations have also been performed to characterize configuration interaction and to estimate the degree of decay branching of the upper levels. The lifetime measurements have been combined with these theoretical considerations and with branching fractions deduced from the emission measurements of Corliss & Bozman to specify the oscillator strengths of these transitions. The results are discussed in the context of spectroscopic data obtained from orbiting telescopes and applied to Hubble Space Telescope spectra to estimate the tungsten abundance in Sirius.
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- Henderson, M., et al.
(author)
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Lifetimes of the 5d ^{9} 6p levels in Hg III
- 1999
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In: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 59:5, s. 4068-4070
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Journal article (peer-reviewed)abstract
- We report measurements and theoretical calculations for the lifetimes of the 5d96p levels in Hg iii with J=0,2,3,4. This is an extension of earlier measurements of the lifetimes of the 5d96p levels in Hg iii with J=1, and now provides data for all 12 of the levels. The results also provide an isoelectronic comparison with earlier studies of these levels in Au ii of the Pt sequence, and a homologous comparison with earlier studies of the 4d95p levels in Ag ii, Cd iii, and In iv in the Pd sequence.
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- Irving, R.E., et al.
(author)
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Accurate transition probabilities for the 2s2 1S - 2s2p 1P transition in Be I and B II
- 1999
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In: Canadian journal of physics (Print). - : Canadian Science Publishing. - 0008-4204 .- 1208-6045. ; 77:2, s. 137-143
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Journal article (peer-reviewed)abstract
- Transition probability determinations are reported for the 2s2 1 S - 2s2p 1P transition in Be I and B II, based on lifetime measurements made by beam-foil excitation. The lifetimes were extracted by the ANDC method, which incorporates cascade-related decay curves into the analysis of the primary decay curve, thus accounting for the effects of cascade repopulation. The results are of higher precision than earlier measurements and improve the agreement with recent theoretical calculations.
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