Screened Radiative Corrections from Hyperfine-Split Dielectronic Resonances in Lithiumlike Scandium

Lestinsky, M.; Lindroth, Eva; Orlov, D. A.; Schmidt, E. W.; Schippers, S.; Böhm, Sebastian; Brandau, C.; Sprenger, F.; Терехов, А. С.; Müller, A.; Wolf, A.

doi:10.1103/physrevlett.100.033001

Cited by 89 publications

(86 citation statements)

References 34 publications

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“…To match the precision obtained by laser spectroscopy on highly charged ions at the GSI, a sensitive spectrometer with good resolving power was used. In Figure 9 the measured signal in the direct observation of the spontaneous emission of the hyperfine transitions F = 4 to F = 3 in the ground state of hy- 45 Sc 18+ with absolute accuracies below 0.0002 eV, a factor of 10 smaller than previous storage ring studies [69]. This remarkable precision (4.6 ppm) in the measured value of the 2s 1/2 − 2p 3/2 transition energy enabled features of the HFS of the 2s state to be resolved.…”

Section: B Highlights Of Hyperfine Splitting Experimentsmentioning

confidence: 88%

Nuclear effects in atomic transitions

Pálffy

2010

Contemporary Physics

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Atomic electrons are sensitive to the properties of the nucleus they are bound to, such as nuclear mass, charge distribution, spin, magnetization distribution, or even excited level scheme. These nuclear parameters are reflected in the atomic transition energies. A very precise determination of atomic spectra may thus reveal information about the nucleus, otherwise hardly accessible via nuclear physics experiments. This work reviews theoretical and experimental aspects of the nuclear effects that can be identified in atomic structure data. An introduction to the theory of isotope shifts and hyperfine splitting of atomic spectra is given, together with an overview of the typical experimental techniques used in high-precision atomic spectroscopy. More exotic effects at the borderline between atomic and nuclear physics, such as parity violation in atomic transitions due to the weak interaction, or nuclear polarization and nuclear excitation by electron capture, are also addressed.

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Section: B Highlights Of Hyperfine Splitting Experimentsmentioning

confidence: 88%

Nuclear effects in atomic transitions

Pálffy

2010

Contemporary Physics

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“…In addition the experimental value of a recent measurement of the hyperfine splitting of lithiumlike 45 Sc 18+ ion, performed by resolving the 2s hyperfine structure in the dielectronic recombination spectrum [57], is given as well.…”

Section: B Li-like Ionsmentioning

confidence: 99%

Ground-state hyperfine structure of H-, Li-, and B-like ions in the intermediate-Zregion

et al. 2008

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The hyperfine splitting of the ground state of H-, Li-, and B-like ions is investigated in details within the range of nuclear numbers Z = 7 − 28. The rigorous QED approach together with the large-scale configuration-interaction Dirac-Fock-Sturm method are employed for the evaluation of the interelectronicinteraction contributions of first and higher orders in 1/Z. The screened QED corrections are evaluated to all orders in αZ utilizing an effective potential approach. The influence of nuclear magnetization distribution is taken into account within the single-particle nuclear model. The specific differences between the hyperfinestructure level shifts of H-and Li-like ions, where the uncertainties associated with the nuclear structure corrections are significantly reduced, are also calculated.

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“…For Mg 7+ we used a scaling factor of 0.9903. The data reduction methods for deriving an experimental MBRRC have been discussed elsewhere in detail (Schippers et al , 2004Schmidt et al 2006;Lukić et al 2007;Lestinsky et al 2008). The total experimental uncertainty for the absolute MBRRC is estimated to be ±25% at a 90% confidence level, due primarily to the ion current calibration (Lampert et al 1996).…”

Section: Methodsmentioning

confidence: 99%

ELECTRON-ION RECOMBINATION OF Mg^{6 +}FORMING Mg^{5 +}AND OF Mg^{7 +}FORMING Mg^{6 +}: LABORATORY MEASUREMENTS AND THEORETICAL CALCULATIONS

Lestinsky

Badnell

Bernhardt

et al. 2012

ApJ

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We have measured electron-ion recombination for C-like Mg 6+ forming Mg 5+ , and for B-like Mg 7+ forming Mg 6+ . These studies were performed using a merged electron-ion beam arrangement at the TSR heavy ion storage ring located in Heidelberg, Germany. Both primary ions have metastable levels with significant lifetimes. Using a simple cascade model we estimate the population fractions in these metastable levels. For the Mg 6+ results, we find that the majority of the stored ions are in a metastable level, while for Mg 7+ the metastable fraction is insignificant. We present the Mg 6+ merged beams recombination rate coefficient for DR via N = 2 → N = 2 core electron excitations (ΔN = 0 DR) and for Mg 7+ via 2 → 2 and 2 → 3 core excitations. Taking the estimated metastable populations into account, we compare our results to state-of-the-art multiconfiguration Breit-Pauli theoretical calculations. Significant differences are found at low energies where theory is known to be unreliable. Moreover, for both ions we observe a discrepancy between experiment and theory for ΔN = 0 DR involving capture into high-n Rydberg levels and where the stabilization is primarily due to a radiative transition of the excited core electron. This is consistent with previous DR experiments on M-shell iron ions which were performed at TSR. The large metastable content of the Mg 6+ ion beam precludes generating a plasma recombination rate coefficient (PRRC). However, this is not an issue for Mg 7+ and we present an experimentally derived Mg 7+ PRRC for plasma temperatures from 400 K to 10 7 K with an estimated uncertainty of less than 27% at a 90% confidence level. We also provide a fit to our experimentally derived PRRC for use in plasma modeling codes.

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Screened Radiative Corrections from Hyperfine-Split Dielectronic Resonances in Lithiumlike Scandium

Cited by 89 publications

References 34 publications

Nuclear effects in atomic transitions

Nuclear effects in atomic transitions

Ground-state hyperfine structure of H-, Li-, and B-like ions in the intermediate-Zregion

ELECTRON-ION RECOMBINATION OF Mg^{6 +}FORMING Mg^{5 +}AND OF Mg^{7 +}FORMING Mg^{6 +}: LABORATORY MEASUREMENTS AND THEORETICAL CALCULATIONS

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Screened Radiative Corrections from Hyperfine-Split Dielectronic Resonances in Lithiumlike Scandium

Cited by 89 publications

References 34 publications

Nuclear effects in atomic transitions

Nuclear effects in atomic transitions

Ground-state hyperfine structure of H-, Li-, and B-like ions in the intermediate-Zregion

ELECTRON-ION RECOMBINATION OF Mg6 +FORMING Mg5 +AND OF Mg7 +FORMING Mg6 +: LABORATORY MEASUREMENTS AND THEORETICAL CALCULATIONS

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ELECTRON-ION RECOMBINATION OF Mg^{6 +}FORMING Mg^{5 +}AND OF Mg^{7 +}FORMING Mg^{6 +}: LABORATORY MEASUREMENTS AND THEORETICAL CALCULATIONS