High-resolution spectroscopy of a single<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">In</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>ion: Progress towards an optical frequency standard

Becker, Thomas E.; Zanthier, J. von; Nevsky, A.; Schwedes, Ch.; Skvortsov, M. A.; Walther, H.; Peik, E.

doi:10.1103/physreva.63.051802

Cited by 101 publications

(43 citation statements)

References 25 publications

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“…state in 115 In + . This is in excellent agreement with the most recent experimental value τ = 0.195(8) s [35]. Based on the reasoning that the present calculation predicts hyperfine structure and transition rates with the same accuracy as in In II, we may expect the lifetimes of the 3 …”

Section: Thesupporting

confidence: 79%

Spectral properties of Sb IV from MCDHF calculations

Jönsson¹,

Verdebout²,

Gaigalas³

2012

J. Phys. B: At. Mol. Opt. Phys.

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We report on extensive relativistic multiconfiguration Dirac-Hartree-Fock (MCDHF) spectrum calculations for Sb IV. Energies, LS-compositions and Landé g J -factors for 60 oddand even-parity states are computed along with lifetimes and rates for transitions between these states. Results for the 5s 2 1 S 0 -5s5p 3 P o 0 hyperfine-induced transition are also presented. Valence and core-valence electron correlation effects are accounted for by explicit configuration interaction. The calculated energies agree very well with experiment, but the labelling of some of the odd states is ambiguous due to close degeneracies between the 5p5d, 5s7p and 5p6s configurations. Computed lifetimes of the excited states are compared with values from cascade-corrected beam-foil measurements.

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Section: Thesupporting

confidence: 79%

Spectral properties of Sb IV from MCDHF calculations

Jönsson¹,

Verdebout²,

Gaigalas³

2012

J. Phys. B: At. Mol. Opt. Phys.

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“…The ability to develop more precise optical frequency standards will open ways to improve Global Positioning System (GPS) measurements and tracking of deep-space probes, perform more accurate measurements of the physical constants and tests of fundamental physics such as searches for nonlinearity of quantum mechanics, gravitational waves, etc. Some of the promising candidates for such ultra-high-precision frequency standards with trapped ions are 27 Al + [2,3], 199 Hg + [4,5], 171 Yb + [6,7], 87 Sr + [8,9], 43 Ca + [10], 115 In + [11], and 137 Ba + . One of the largest sources of systematic errors in such frequency standards with monovalent ions is due to interaction of the quadrupole moments of metastable states with stray electric field gradients [12,13].…”

Section: Introductionmentioning

confidence: 99%

Electric quadrupole moments of metastable states ofCa+,Sr+, andBa
Jiang
¹
,
Arora
²
,
Safronova
³

2008
Phys. Rev. A
34
4
40
0
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Electric quadrupole moments of the metastable nd 3/2 and nd 5/2 states of Ca + , Sr + , and Ba + are calculated using the relativistic all-order method including all single, double, and partial triple excitations of the Dirac-Hartree-Fock wave function to provide recommended values for the cases where no experimental data are available. The contributions of all non-linear single and double terms are also calculated for the case of Ca + for comparison of our approach with the CCSD(T) results. The third-order many body perturbation theory is used to evaluate contributions of high partial waves and the Breit interaction. The remaining omitted correlation corrections are estimated as well. Extensive study of the uncertainty of our calculations is carried out to establish accuracy of our recommended values to be 0.5% -1% depending on the particular ion.

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“…So far, the only experimental values for ns np 3 P 0 → ns 2 1 S 0 hyperfine induced (HFI) transition rates were obtained for In + (n=5) [8] stored in a radio frequency trap and for Be-like N 3+ from astrophysical observations [9]. Although the latter result had a rather large uncertainty of ±33%, it allows one to discriminate between the two theoretical values [1,3] that are available for this ion and that differ by almost a factor of 4.…”

Section: Introductionmentioning

confidence: 99%

Photorecombination of berylliumlike Ti¹⁸⁺: Hyperfine quenching of dielectronic resonances

Schippers

Schmidt

Bernhardt

et al. 2007

J. Phys.: Conf. Ser.

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Abstract. The photorecombination spectrum of 48 Ti 18+ was measured employing the merged electron-ion beams technique at a heavy-ion storage ring. The experimental electron-ion collision energy range 0−80 eV comprises all dielectronic recombination (DR) resonances associated with 2s → 2p (∆N = 0) core excitations as well as trielectronic recombination (TR) resonances that involve 2s 2 → 2p 2 core double-excitations. At low collision energies DR resonances are observed that are associated with the excitation of metastable 2s 2p 3 P0 primary ions with nearly infinite lifetime for the isotope 48 Ti with zero nuclear spin. For the isotope 47 Ti with nonzero nuclear spin hyperfine quenching of these resonances occurs. The procedure for obtaining the associated time constant from a recombination measurement is outlined. IntroductionThe ns np 3 P 0 state in divalent atoms and ions is the first excited state above the ns 2 1 S 0 ground state. Its decay by a one-photon J = 0 → J = 0 transition is strictly forbidden and the lifetime of the 3 P 0 state is nearly infinite provided the ion has zero nuclear spin (I = 0). If I > 0 the hyperfine interaction mixes levels with different J and, consequently, the 3 P 0 level acquires a finite lifetime. This hyperfine quenching has been treated theoretically for Be-like, Mg-like and Zn-like ions [1,2,3,4]. Theoretical work on neutral alkaline-earth-metal atoms [5,6] was motivated by the idea to use the hyperfine induced 3 P 0 → 1 S 0 transition in ultraprecise atomic clocks. In another application the 13 C 2+ ( 3 P 0 → 1 S 0 ) fluorescence from planetary nebulae was measured to infer the 13 C/ 12 C abundance ratio and, thereby, to gain insight into stellar nucleosynthesis [7].So far, the only experimental values for ns np 3 P 0 → ns 2 1 S 0 hyperfine induced (HFI) transition rates were obtained for In + (n=5) [8] stored in a radio frequency trap and for Be-like N 3+ from astrophysical observations [9]. Although the latter result had a rather large uncertainty of ±33%, it allows one to discriminate between the two theoretical values [1,3] that are available for this ion and that differ by almost a factor of 4. In view of these theoretical uncertainties it is evident that accurate experimental benchmarks are highly desirable, especially for few electron systems such as Be-like ions where correlation effects are particularly strong.In the present work the hyperfine quenching of the 2s 2p 3 P 0 state of Be-like 47 Ti 18+ was observed in dielectronic recombination (DR) experiments carried out at the heavy-ion

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High-resolution spectroscopy of a singleIn+ion: Progress towards an optical frequency standard

Cited by 101 publications

References 25 publications

Spectral properties of Sb IV from MCDHF calculations

Spectral properties of Sb IV from MCDHF calculations

Electric quadrupole moments of metastable states ofCa+,Sr+, andBa
Jiang
¹
,
Arora
²
,
Safronova
³

2008
Phys. Rev. A
34
4
40
0
View full text Add to dashboard Cite

Photorecombination of berylliumlike Ti¹⁸⁺: Hyperfine quenching of dielectronic resonances

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High-resolution spectroscopy of a singleIn+ion: Progress towards an optical frequency standard

Cited by 101 publications

References 25 publications

Spectral properties of Sb IV from MCDHF calculations

Spectral properties of Sb IV from MCDHF calculations

Electric quadrupole moments of metastable states ofCa+,Sr+, andBaJiang1, Arora2, Safronova3 2008Phys. Rev. A344400View full textAdd to dashboardCite

Photorecombination of berylliumlike Ti18+: Hyperfine quenching of dielectronic resonances

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Product

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About

Electric quadrupole moments of metastable states ofCa+,Sr+, andBa
Jiang
¹
,
Arora
²
,
Safronova
³

2008
Phys. Rev. A
34
4
40
0
View full text Add to dashboard Cite

Photorecombination of berylliumlike Ti¹⁸⁺: Hyperfine quenching of dielectronic resonances