| 1. |
- Jönsson, Per, et al.
(författare)
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Hyperfine structures, isotope shifts and transition rates of C II, N III, and O IV from relativistic configuration interaction calculations
- 2010
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Ingår i: Atomic Data and Nuclear Data Tables. - : Elsevier. - 0092-640X .- 1090-2090. ; 96:3, s. 271-298
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Tidskriftsartikel (refereegranskat)abstract
- Energy levels, specific mass shift parameters, hyperfine interaction constants, Landé gJ factors, and transition probabilities between computed levels are reported for C II, N III, and O IV. Results include levels belonging to 2s22p,2s2p2,2p3,2s23s,2s23p,2s23d,2s2p3s and, in the case of C II, the 2s24s and 2s24p configurations. Wavefunctions were determined using the multiconfiguration Dirac–Hartree–Fock method and account for valence, core–valence, and core–core correlation effects.
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| 2. |
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| 3. |
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| 4. |
- Kang, Huihui, et al.
(författare)
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Hyperfine quenching of the 3s3p^3P_0 state in Mg-like ions
- 2009
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Ingår i: Journal of Physics B. - : Bibliopolis, Edizioni di Filosofia e Scienze. - 0953-4075 .- 1361-6455. ; 42:19
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Tidskriftsartikel (refereegranskat)abstract
- Hyperfine quenching rates of the 3s3p 3P0 level in Mg-like ions were calculated using the GRASP2K package based on the multi-configuration Dirac–Hartree–Fock method. Valence and core-valence correlation effects were accounted for in a systematic way. Breit interactions and QED effects were included in the subsequent relativistic CI calculations. Calculated rates were compared with other theoretical values and with experiment, and a good agreement with the latest experimental value for the 27Al+ ion (Rosenband et al 2007 Phys. Rev. Lett. 98 220801) was found. Furthermore, we showed in detail the contributions from Breit interaction and QED effects to concerned physical properties. Finally, electronic data were presented in terms of a general scaling law in Z that, given isotopic nuclear spin and magnetic moment, allows hyperfine-induced decay rates to be estimated for any isotope along the isoelectronic sequence.
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| 5. |
- Li, Jiguang, et al.
(författare)
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Effects of the electron correlation and Breit and hyperfine interactions on the lifetime of the 2p53s states in neutral neon
- 2012
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Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - : Americal Physical Society. - 1050-2947 .- 1094-1622. ; 86:5
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Tidskriftsartikel (refereegranskat)abstract
- In the framework of the multiconfiguration Dirac-Hartree-Fock method, we investigate the transition properties of four excited states in the 2p53s configuration of neutral neon. The electron correlation effects are taken into account systematically by using the active space approach. The effect of higher-order correlation on fine structures is shown. We also study the influence of the Breit interaction and find that it reduces the oscillator strength of the 3 P1o-1 S0 transition by 17%. It turns out that the inclusion of the Breit interaction is essential even for such a light atomic system. Our ab initio calculated line strengths, oscillator strengths, and transition rates are compared with other theoretical values and experimental measurements. Good agreement is found except for the 3 P2o-1 S0 M2 transition for which discrepancies of around 15% between theories and experiments remain. In addition, the impact of hyperfine interactions on the lifetimes of the 3 P0o and 3 P2o metastable states is investigated for the 21Ne isotope (I=3/2). We find that hyperfine interactions reduce the lifetimes drastically. For the 3 P0o state the lifetime is decreased by a factor of 630.
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| 6. |
- Li, Jiguang, et al.
(författare)
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Hyperfine induced 1s2s^1S_0 -> 1s^2^1S_0 M1 transition of He-like ions
- 2009
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Ingår i: European Physical Journal D. - : EDP Sciences. - 1434-6060 .- 1434-6079. ; 51:3, s. 313-317
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Tidskriftsartikel (refereegranskat)abstract
- Hyperfine induced SS0 M1 transition probabilities of He-like ions have been calculated from relativistic configuration interaction wavefunctions including the frequency independent Breit interaction and QED effects. Present results for 151Eu and 155Gd are in good agreement with previous calculations [L.N. Labzowsky et al., Phys. Rev. A 63, 054105 (2001)]. Electronic data are given in terms of a general scaling law in Z that, given isotopic nuclear spin and magnetic moment, allows hyperfine induced decay rates to be estimated for any isotope. The results should be helpful for future experimental investigations on QED and parity non-conservation effects.
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| 7. |
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| 8. |
- Li, Jiguang, et al.
(författare)
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Hyperfine induced transitions in He-like, Be-like and Mg-like ions
- 2009
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Ingår i: Journal of Physics, Conference Series. - : Bibliopolis, Edizioni di Filosofia e Scienze. - 1742-6588 .- 1742-6596. ; 194:15
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Tidskriftsartikel (refereegranskat)abstract
- Hyperfine quenching rates for 1s2s 1S0 → 1s2 1S0 M1 transition of He-like ions, 2s2p 3P0 → 3P2 → 2s2 1S0 E1 transition of Be-like ions and 3s3p 3P0 → 3s2 S0 E1 transition of Mg-like ions have been calculated from relativistic configuration interaction wavefunctions including the frequency independent Breit interaction and QED effects. The present study not only supply accurate theoretical values for developing atomic clocks, diagnosing low-density plasma, probing nuclear properties, exploring weak interaction beyond standard model, but also to analyze some characteristics in hyperfine induced transitions.
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| 9. |
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| 10. |
- Li, Jiguang, et al.
(författare)
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MF -dependent Hyperfine Induced Transition Rates in an External Magnetic Field for Be-like 47Ti18
- 2011
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Ingår i: Physics Letters A. - : Elsevier. - 0375-9601 .- 1873-2429. ; 375:5, s. 914-917
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Tidskriftsartikel (refereegranskat)abstract
- Hyperfine induced 2s2pP03→2s2S01 transition rates in an external magnetic field for Be-like 47Ti were calculated based on the multiconfiguration Dirac-Fock method. It was found that the transition probability is dependent on the magnetic quantum number M of the excited state, even in the weak field. The present investigation clarifies that the difference of the hyperfine induced transition rate of Be-like Ti ions between experiment [Schippers, et al., Phys. Rev. Lett. 98 (2007) 033001(4)] and theory does not result from the influence of external magnetic field.
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