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- Lindroth, Eva, et al.
(författare)
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QED effects in Cu-like Pb recombination resonances near threshold
- 2001
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Ingår i: Physical Review Letters. - 0031-9007. ; 86:22, s. 5027-5030
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Tidskriftsartikel (refereegranskat)abstract
- In an electron-ion recombination study with Pb53+ dielectronic recombination resonances are found for as low as similar to 10(-3)-10(-4) eV relative energy. The resonances have been calculated by relativistic many-body perturbation theory and through comparison with experiment the Pb53+(4p(1/2)-4s(1/2)) energy splitting of similar to 118 eV is determined with an accuracy comparable to the position of the first few resonances, i.e., similar to 10(-3) eV. Such a precision provides a test of QED in a many-body environment at a level which can still not be reached in calculations.
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| 6. |
- Pesic, Z. D., et al.
(författare)
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Two-photon coincidence studies of highly-charged ion relaxation in solids
- 2009
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Ingår i: European Physical Journal D. - : Springer Science and Business Media LLC. - 1434-6060 .- 1434-6079. ; 54:3, s. 623-628
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Tidskriftsartikel (refereegranskat)abstract
- We studied the relaxation of hollow atoms by two-photon transitions during the stopping of slow (E=8.5q keV) highly charged Pbq+ (q=53-58) ions in a thin Ta foil. The X-rays emitted during the relaxation process were detected in coincidence with two Si(Li) detectors. Particular attention was paid to the role of the internal dielectronic excitation (IDE) in the relaxation dynamics. We found a clear contribution to relaxation by the IDE process also for projectiles with initial M-shell vacancies and IDE speeds up relaxation of electrons from high Rydberg states by directly filling vacancies in the N-shell that is accompanied with the excitation of M-shell electrons. We discuss the relaxation mechanism, and present results for the fluorescence yield and the IDE probability of highly charged Pb ions in a solid.
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| 7. |
- Tokman, M, et al.
(författare)
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Accurate calculations on dielectronic recombination resonances in Cu-like Pb
- 2001
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Ingår i: Hyperfine Interactions. - 0304-3843. ; 132:1-4, s. 383-389
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Tidskriftsartikel (refereegranskat)abstract
- Dielectronic recombination of Pb53+ has been studied and a resonance is detected only similar to 0.1 meV above the ground state. The possibility to determine the 4p(1/2) - 4s(1/2) energy splitting with a similar accuracy from the determination of the resonance position is discussed. Such a precision can only be achieved by calculations which treat QED in a many-body environment at levels which can still not be reached. A fully relativistic many-body calculation of the splitting is described and the uncertainties are discussed.
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