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Dunford, R. W.; Berry, H. G.; Cheng, Song; Kanter, E. P.; Kurtz, C.; Zabransky, B. J.; Livingston, A. E.; Curtis, L. J.

doi:10.1103/physreva.48.1929

Cited by 23 publications

(13 citation statements)

References 48 publications

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“…Apart from the one-photon bound-bound transitions, the two-photon decays of metastable ionic states have also attracted much interest since the analysis of its properties may reveal unique information about the complete spectrum of the ion, including negative energy (positron) solutions of Dirac's equation. Until now, however, most two-photon studies were focused on measuring the total and energy-differential decay rates [4][5][6][7][8][9][10] which were found in good agreement with theoretical predictions, based on relativistic calculations [11][12][13][14][15][16][17][18][19][20]. In contrast, much less attention has been previously paid to the angular and polarization correlations between the emitted photons.…”

Section: Introductionmentioning

confidence: 94%

Angular correlations in the two-photon decay of heliumlike heavy ions

et al. 2010

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The two-photon decay of heavy, helium-like ions is investigated based on second-order perturbation theory and Dirac's relativistic equation. Special attention has been paid to the angular emission of the two photons (i.e., how the angular correlation function depends on the shell structure of the ions in their initial and final states). Moreover, the effects from the (electric and magnetic) nondipole terms in the expansion of the electron-photon interaction are discussed. Detailed calculations have been carried out for the two-photon decay of the 1s2s 1 S 0 , 1s2s 3 S 1 , and 1s2p 3 P 0 states of helium-like Xe 52+ , Au 77+ , and U 90+ ions.A. SURZHYKOV et al. PHYSICAL REVIEW A 81, 042510 (2010)

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Section: Introductionmentioning

confidence: 94%

Angular correlations in the two-photon decay of heliumlike heavy ions

et al. 2010

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“…The lifetime of the 2 1 S 0 level in He-like ions has been measured from Z ¼ 2 to Z ¼ 41 [11,35,36,38,[44][45][46][47][48][49]. The most precise measurements have been made in Kr 34þ [46], Br 33þ [49], and Ni 26þ [35] where uncertainties of about 1% have been reported. Two-photon decay has also been studied in the decay of K-holes in neutral atoms.…”

Section: Introductionmentioning

confidence: 91%

“…They observed the continuum radiation from decay of the 2 2 S 1=2 level in H-like argon and the 2 1 S 0 level in Helike argon using a pair of Si(Li) detectors looking face to face downstream on the excited ion beam. This method of applying coincident detection of both the photons has also been used to observe the two-photon continuum in H-like Ni [44], Kr [42] and Nb [45], and He-like Ni [44], Br [49], Kr [46] and Ag [45]. These experiments resulted in measurements of the lifetimes of the two-photon-emitting states but detailed measurements of the shapes of the continua were not attempted.…”

Section: Two-photon Spectral Shape In Heavy Ionsmentioning

confidence: 99%

“…The lifetime of the 2 2 S 1=2 level in H-like ions has been measured for a number of ions in the range Z ¼ 1 to Z ¼ 47 [35][36][37][38][39][40][41][42][43][44][45], with results at the level of 1% being reported for Ar 17þ [38] and Ni 27þ [35]. The lifetime of the 2 1 S 0 level in He-like ions has been measured from Z ¼ 2 to Z ¼ 41 [11,35,36,38,[44][45][46][47][48][49]. The most precise measurements have been made in Kr 34þ [46], Br 33þ [49], and Ni 26þ [35] where uncertainties of about 1% have been reported.…”

Section: Introductionmentioning

confidence: 99%

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Two-Photon Decay in Heavy Atoms and Ions

Mokler¹,

Dunford²

2004

Phys. Scr.

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We review the status of and comment on current developments in the field of two-photon decay in atomic physics research. Recent work has focused on twophoton decays in highly-charged ions and two-photon decay of inner-shell vacancies in heavy neutral atoms. We emphasize the importance of measuring the shape of the continuum emission in two-photon decay as a probe of relativistic effects in the strong central fields found in heavy atomic systems. New experimental approaches and their consequences will be discussed.

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“…This value and its uncertainty of 13% were later improved to (2.32 ± 0.2) ns (8%) [33]. For Ni (Z = 28) an uncertainty of 1% was reached [34,35], for Br (Z = 35) the uncertainty was 0.8% [36], and for Kr (Z = 36) the uncertainty was 1% [37]. Thus the high-Z trend seems well-established, but experiments delivering more accurate data on low-Z ions would be desirable.…”

Section: Introductionmentioning

confidence: 92%

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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Two-photon decay of the 21S0state in

Cited by 23 publications

References 48 publications

Angular correlations in the two-photon decay of heliumlike heavy ions

Angular correlations in the two-photon decay of heliumlike heavy ions

Two-Photon Decay in Heavy Atoms and Ions

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

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Two-photon decay of the 21S0state in

Cited by 23 publications

References 48 publications

Angular correlations in the two-photon decay of heliumlike heavy ions

Angular correlations in the two-photon decay of heliumlike heavy ions

Two-Photon Decay in Heavy Atoms and Ions

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

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Product

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