Experimental and theoretical investigations of visible spectra of W12+

Lu, Qifeng; Fu, Ning; Yan, Congquan; Qu, Fangfang; Yang, Y.; Wang, K.; Chen, C.Y.; Zou, Yaming; Xiao, Jun

doi:10.1016/j.jqsrt.2022.108064

Cited by 5 publications

(3 citation statements)

References 63 publications

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“…Thus, W 14+ is the highest charge state ion that can be generated in the electron-beam energy of 300 eV. The observed emission lines were assigned through comparison with previous measurements [22][23][24][25][26]. The results in figure 2(a) indicate the successful injection of tungsten atoms into the EBIT and the production of highly charged W ions.…”

Section: Methodsmentioning

confidence: 56%

Injection of metallic elements into an electron-beam ion trap using an electron impact metal vapor source

Kimura,

Kiyama,

Ito

et al. 2023

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

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We demonstrate a versatile method for injecting metallic elements into an electron-beam ion trap using a metal vapor source.This method is based on the evaporation of a metal target by continuous electron-beam impact. We present visible emission spectra of highly charged tungsten ions prepared by the present injection scheme.By comparison with the conventional injection method using a high-vapor-pressure W(CO)$_6$ compound, several advantages of the present method, i.e., suppressing charge exchange reactions in the trap region and quick recovery of the vacuum condition after stopping the injection, are found.The present injection method also facilitates the measurement of emission spectra of highly charged niobium ions, which have never previously been observed using electron-beam ion traps.

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Section: Methodsmentioning

confidence: 56%

Injection of metallic elements into an electron-beam ion trap using an electron impact metal vapor source

Kimura,

Kiyama,

Ito

et al. 2023

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

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“…Lifetime measurements of optical transitions in Mo XXII were reported in [33]. Some more of those investigations are listed here: [34] reported W VI to W VIII spectra; [30] analyzed the spectra of Pm-like W XIV; [23] worked on W VIII; [26] re-assessed earlier work on W XII; [35] analyzed W XIII; W XIV was studied in [36]; in [27] observed spectra from ions W XXI up to W XXX were reported. Spectral data from Yb and W were recorded in [25], where the In-like Yb XXII and W XXVI and Sn-like W XXV were compared with detailed calculations.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical Ritz–Rydberg analysis of the electronic structure of highly charged ions of lead and bismuth by optical spectroscopy

Rosner,

Rehbehn,

Crespo López-Urrutia

2024

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

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Intra-configuration fine-structure transitions in highly charged ions(HCI) result in most cases from changes in the coupling of equivalent electrons.They are multipole forbidden to varying degrees and often occur within the opticalrange. In HCI with semi-filled nd and nf subshells, electrons can in principlecouple to states which are energetically close but with very different total angularmomenta, e.g. 0 ≤ J ≤ 10. This gives rise to metastable states with verylong lifetimes that exhibit particularly interesting clock transitions or, as in thecase of orbital level crossings, acquire a considerable sensitivity to a possiblevariation of the fine-structure constant α. We investigate both experimentallyand theoretically connecting the ground state and adjacent states of Pb XXIIto Pb XXXIV and Bi X to Bi XV, respectively, covering complex couplings ofelectrons in the 4f and 5d shells. These and others such as nd and nf , whichalso contain equivalent electrons, are of interest for frequency metrology usingquantum logic spectroscopy, for atomic structure and QED theory tests, and forthe search for Dark Matter candidates. We infer their level structure, benchmarkcalculations from two different electronic structure codes, and lay the groundworkfor inferring the wavelengths of forbidden transitions of higher multipolarity inthe optical and VUV region.

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“…Their 4f-or 5p − excitation causes a lot of transitions with energies in the optical range. There has been greatly renewed interest in the spectral emission of tungsten from high-temperature plasma [116,126,[128][129][130][131][132]. Tables 6, Tables 7, Tables 8, Tables 9, Tables 10 compile a series of HCIs that underline the orbital energy-crossings in their electronic configurations.…”

mentioning

confidence: 99%

Highly charged ion (HCI) clocks: Frontier candidates for testing variation of fine-structure constant

Sahoo²,

Suo³

2023

Front. Phys.

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Attempts are made to unify gravity with the other three fundamental forces of nature. As suggested by higher dimensional models, this unification may require space and time variation of some of the dimensionless fundamental constants. In this scenario, probing temporal variation of the electromagnetic fine structure constant (α=e2ℏc) in a low energy regime at the cosmological time scale is of immense interest. Atomic clocks are ideal candidates for probing α variation because their transition frequencies are measured with ultra-high precision. Since atomic transition frequency is a function of α, measurement of a clock frequency at different temporal and spatial locations can yield signatures to ascertain variation of α. Highly charged ions (HCIs) are very sensitive to variation of α and are least affected by external perturbations, making them excellent platforms for searching for temporal variation of α. In this work, we overview HCIs suitable for building atomic clocks because of their spectroscopic features and sensitivity to variation of α. The selection of HCI clock candidates is outlined based on two general rules—by analyzing trends in fine structure splitting and level-crossing patterns along a series of isoelectronic atomic systems of the periodic table. Two variants of relativistic many-body methods in the configuration interaction and coupled-cluster theory frameworks are employed to determine the properties of HCIs proposed for atomic clocks. These methods treat electronic correlation and relativistic effects under the frame of the Dirac-Coulomb Hamiltonian rigorously, while other higher-order relativistic effects are included approximately. Typical systematic effects of the HCI clock frequency measurements are discussed using the calculated atomic properties. This review will help understand limits and potentials of the proposed HCIs as the prospective atomic clock candidates and guide future HCI clock experiments.

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Experimental and theoretical investigations of visible spectra of W12+

Cited by 5 publications

References 63 publications

Injection of metallic elements into an electron-beam ion trap using an electron impact metal vapor source

Injection of metallic elements into an electron-beam ion trap using an electron impact metal vapor source

Experimental and theoretical Ritz–Rydberg analysis of the electronic structure of highly charged ions of lead and bismuth by optical spectroscopy

Highly charged ion (HCI) clocks: Frontier candidates for testing variation of fine-structure constant

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