Relativistic many-body calculation of energies, multipole transition rates, and lifetimes in tungsten ions

Safronova, U. I.; Safronova, M. S.; Nakamura, Nobuyuki

doi:10.1103/physreva.95.042510

Cited by 8 publications

(11 citation statements)

References 43 publications

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“…It was demonstrated in Ref. [16] that M1 transition rates are larger by factor of 10 -100 than E2 contributions. As a result, we present in Table IV,the M1 transition rate for 20 transitions in Ho 19+ , Er 20+ , and Tm 21+ ions.…”

Section: Resultsmentioning

confidence: 97%

“…The CI+all-order (SD) approach described in Ref. [16] was applied in this study for calculating the energies, wavelengths, and transition rates of low-lying levels in Cd-like Ho 19+ , Er 20+ , and Tm 21+ ions. Table II shows the energies for all the fine structure levels of 4f 2 configuration.…”

Section: Calculationsmentioning

confidence: 99%

“…For example, visible spectra of W ions have been extensively studied with electron beam ion traps (EBITs) [13,14]. Theoretical analysis for identifying those experimental spectra has also been performed [15,16]. For the visible transitions useful for an atomic clock, theoretical studies [2,8,12] have taken a lead role, and several experimental efforts [17,18] to identify the proposed transitions have followed the theoretical studies.…”

Section: Introductionmentioning

confidence: 99%

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Visible transitions in Ag-like and Cd-like lanthanide ions

et al. 2017

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We present visible spectra of Ag-like ($4d^{10}4f$) and Cd-like ($4d^{10}4f^2$) ions of Ho (atomic number $Z=67$), Er (68), and Tm (69) observed with a compact electron beam ion trap. For Ag-like ions, prominent emission corresponding to the M1 transitions between the ground state fine structure splitting $4f_{5/2}$--$4f_{7/2}$ is identified. For Cd-like ions, several M1 transitions in the ground state configuration are identified. The transition wavelength and the transition probability are calculated with the relativistic many-body perturbation theory and the relativistic CI + all-order approach. Comparisons between the experiments and the calculations show good agreement

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Section: Resultsmentioning

confidence: 97%

Section: Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Visible transitions in Ag-like and Cd-like lanthanide ions

et al. 2017

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“…The corresponding correction value was perturbatively computed in the RCI calculation through the exchange of a single transverse photon in the low-frequency limit 41,68 . Comparing the Breit contributions obtained from the perturbative approach to calculations in which the Breit term is included in a variational SCF process allows us to estimate the uncertainty due to the perturbative approach 69,70 . Previous studies have found that the magnitude of this effect is less than 0.3% in the Ni-like case (among others) 69,70 and that it is significantly reduced when the active space is expanded.…”

Section: Estimation Of Uncertainties For the Theoretical Valuesmentioning

confidence: 99%

Hyperfine-structure-resolved laser spectroscopy of many-electron highly charged ions

et al. 2023

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Hyperfine structures of highly charged ions (HCIs) are favourable spectroscopic targets for exploring fundamental physics along with nuclear properties. Recent proposals of HCI atomic clocks highlight their importance, especially for many-electron HCIs, and they have been theoretically investigated by refining atomic-structure calculations. However, developments in hyperfine spectroscopy of many-electron HCIs have not proceeded due to experimental difficulty. Here, we demonstrate hyperfine-structure-resolved laser spectroscopy of HCIs in an electron beam ion trap plasma, employing the magnetic-dipole transition in the 4d95s state of 127I7+. Ion-state manipulation by controlled electron collisions in the well-defined laboratory plasma enables laser-induced fluorescence spectroscopy of trapped HCIs. The observed spectrum of evaporatively cooled ions under low magnetic fields shows characteristic features reflecting the hyperfine structures. The present demonstration using combined optical and plasma approaches provides a benchmark for state-of-the-art atomic calculations of hyperfine structures in many-electron HCIs, and offers possibilities for a variety of unexploited experiments.

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“…The CI+all-order method was demonstrated to produce accurate results for a wide range of atomic properties for atoms and ions with 2 to 4 valence electrons [19][20][21][22]. This method has provided precision data for many applications, including development of ultra-precise clocks [19,21,23], studies of fundamental symmetries [24,25], searches for the variation of fundamental constants [26], quantum simulation and computation [27,28], plasma physics [29], nuclear physics [22,30], and many others. It was previously thought to be unfeasible to apply this method to systems such as Cr due to extremely large number of configurations that have to be considered as well as limitation of the initial closed-shell approximation.…”

Section: Introductionmentioning

confidence: 99%

Laser Spectroscopy of the y$^7$P$_J^{\circ}$ states of Cr I

Norrgard,

Barker,

Eckel

et al. 2021

Preprint

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Here we report measured and calculated values of decay rates of the 3d 4 ( 5 D)4s4pstates of Cr I. The decay rates are measured using time-correlated single photon counting with roughly 1 % total uncertainty. In addition, the isotope shifts for these transitions are measured by laser induced fluorescence to roughly 0.5 % uncertainty. The decay rate calculations are carried out by a hybrid approach that combines configuration interaction and the linearized coupled cluster method (CI+all-order method). The measurements provide a much needed precision benchmark for testing the accuracy of the CI+all-order approach for such complicated systems with six valence electrons, allowing to significantly expand its applicability. These measurements also demonstrate operation of a cryogenic buffer gas beam source for future experiments with MgF molecules toward quantum blackbody thermometry.

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Relativistic many-body calculation of energies, multipole transition rates, and lifetimes in tungsten ions

Cited by 8 publications

References 43 publications

Visible transitions in Ag-like and Cd-like lanthanide ions

Visible transitions in Ag-like and Cd-like lanthanide ions

Hyperfine-structure-resolved laser spectroscopy of many-electron highly charged ions

Laser Spectroscopy of the y$^7$P$_J^{\circ}$ states of Cr I

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