Magnetic dipole transition rates in B-like and F-like titanium ions measured at a heavy-ion storage ring

Gwinner, G.; Wolf, A.; Tordoir, Xavier; Calamai, Anthony G.

doi:10.1016/s0375-9601(99)00801-4

Cited by 32 publications

(20 citation statements)

References 21 publications

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“…In previous experiments using optical detection [21,38], a meaningful evaluation was possible, because the solar blind detector had a very low dark rate. Thus, the optical signal could be evaluated -albeit at a somewhat poorer statistical reliability level -based on the tail of the curve after cutting out the section that was corrupted by ion dynamical processes.…”

Section: Resultsmentioning

confidence: 99%

“…Heavy-ion storage rings offer long storage times, small effects of collisions with the residual gas, separation of ion production and storage regions, and charge-state selectivity. They thus provide a favorable environment for atomic lifetime measurements in the range from a fraction of a millisecond [18,38] up to fractions of a second [40]. The technique has been described before [17,18,21] so that only the new developments need to be explained in detail.…”

Section: Methodsmentioning

confidence: 99%

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Heavy-ion storage-ring quest for atomic lifetimes in Li⁺ and Be²⁺

Gwinner¹,

Knystautas²,

Wolf³

2003

Can. J. Phys.

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Decays of metastable levels in the He-like ions Li + and Be 2+ were studied at a heavy-ion storage ring. The lifetimes involved span five orders of magnitude (from 0.5 ms to 50 s) and thus test the performance envelope of the experimental technique. For the 1s2s 3 S 1 level in Be 2+ ions, our lifetime result of (1.80 ± 0.05) s agrees with accurate nonrelativistic and relativistic calculations. While theory in these cases is expected to be well developed, experience reflects on the capabilities of the experimental arrangement. The time-resolved observations reveal information on cross sections for collisional 39.90.+d, 31.50.+w Résumé : La désexcitation des niveaux métastables dans les ions héliumoïdes Li + et Be 2+ a été étudiée dans un anneau de stockage d'ions lourds. Les durées de vie correspondantes couvrent une étendue de cinq ordres de grandeur (de 0,5 ms à 50 s) repoussant ainsi les limites de cette technique expérimentale. Pour le niveau 1s2s 3 S 1 de l'ion Be 2+ , notre durée de vie mesurée de (1,80 ± 0,05) s est en accord avec des calculs précis relativistes ainsi que non-relativistes. La théorie reposant sur des bases solides dans de tels cas, l'étude néanmoins démontre le bien-fondé de cette approche expérimentale. Les mesures avec résolution temporelle ont permis l'obtention des résultats sur les sections efficaces de désexcitation par collisions.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Heavy-ion storage-ring quest for atomic lifetimes in Li⁺ and Be²⁺

Gwinner¹,

Knystautas²,

Wolf³

2003

Can. J. Phys.

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“…In this context, particular hope rests on the progress in the development of electron beam ion trap (EBIT) devices, which have demonstrated their capability to provide not only spectral observation of forbidden transitions like the solar coronal lines, but also to measure radiative lifetimes reliably in the millisecond range (Träbert, Utter & Beiersdorfer 2000a; Träbert et al 2000b). Once the wavelengths are known, an alternative, very accurate technique to measure millisecond atomic lifetimes is offered by using heavy‐ion storage rings (Träbert et al 1999). Our transition energies and probabilities may propel the analysis of such lines and, possibly, also entire new lifetime measurements.…”

Section: Resultsmentioning

confidence: 99%

Energy levels, lifetimes and branch fractions for Fe XI

Fritzsche

Dong

2000

Monthly Notices of the Royal Astronomical Society

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We present transition energies, probabilities and branching ratios for the electric dipole allowed (E1) and forbidden (M1, E2, M2) lines of the 3s23p4, 3s3p5 and 3s23p33d configurations of Fe xi. Large‐scale multiconfiguration Dirac–Fock wavefunctions are applied to include the effects of relativity, correlation and rearrangement of the electron density consistently within the same (computational) model. From the transition probabilities, lifetimes of the 46 lowest‐lying excited levels are derived, and the prospects for experimental verification are discussed. An M2 transition is identified in the solar extreme ultraviolet spectrum.

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“…B-and F-like ions both have a 2s 2 2p k 2 P o ground term with two fine-structure levels (only the J = 1/2, 3/2 level sequence differs), giving rise to a single fine-structure transition that is prominent in solar spectra. Lifetime measurements have been tried using the combination of an ECR ion source and Kingdon trap at Texas A&M and at Reno [17,21], at the NIST and Livermore electron-beam ion traps [52,73,87,88], and at the Heidelberg heavy-ion storage ring [52,53,74]. The results of the Kingdon-trap experiments and of the experiment at the NIST EBIT agree with each other at the typically uncertainties claimed, but they clearly deviate from theory by much more than the error estimates.…”

Section: Forbidden Transitionsmentioning

confidence: 91%

Precise atomic lifetime measurements with stored ion beams and ion traps

Träbert¹

2002

Can. J. Phys.

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For many years, atomic lifetime measurements on multiply-charged ions have been done almost exclusively by beam-foil spectroscopy. For low ion charges, however, spin-changing "intercombination" transitions have a rate that renders them too slow for traditional fast-beam techniques. Here ion traps and fast-ion beams have been combined in the concept of heavy-ion storage rings. These devices have permitted not only an extension of intercombination lifetime measurements down to singly charged ions, but they also facilitated similar measurements on electric-dipole forbidden transitions. The electron-beam ion trap (EBIT) complements the storage-ring work for work on highly charged ions. Achievements, technical issues, and prospects are outlined. PACS Nos.: 32.70Cs, 32.30Jc, 34.50Fa

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Magnetic dipole transition rates in B-like and F-like titanium ions measured at a heavy-ion storage ring

Cited by 32 publications

References 21 publications

Heavy-ion storage-ring quest for atomic lifetimes in Li⁺ and Be²⁺

Heavy-ion storage-ring quest for atomic lifetimes in Li⁺ and Be²⁺

Energy levels, lifetimes and branch fractions for Fe XI

Precise atomic lifetime measurements with stored ion beams and ion traps

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Magnetic dipole transition rates in B-like and F-like titanium ions measured at a heavy-ion storage ring

Cited by 32 publications

References 21 publications

Heavy-ion storage-ring quest for atomic lifetimes in Li+ and Be2+

Heavy-ion storage-ring quest for atomic lifetimes in Li+ and Be2+

Energy levels, lifetimes and branch fractions for Fe XI

Precise atomic lifetime measurements with stored ion beams and ion traps

Contact Info

Product

Resources

About

Heavy-ion storage-ring quest for atomic lifetimes in Li⁺ and Be²⁺

Heavy-ion storage-ring quest for atomic lifetimes in Li⁺ and Be²⁺