Direct determination of the energy of the first excited fine-structure level in 
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Kimura, Naoki; Kodama, Ryunosuke; Suzuki, K.; Oishi, Shimpei; Wada, M.; Okada, Kazuya; Ohmae, Noriaki; Katori, Hidetoshi; Nakamura, Nobuyuki

doi:10.1103/physreva.100.052508

Cited by 21 publications

(15 citation statements)

References 32 publications

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“…HCI clocks are expected to be a sensitive probe for time variations of the fine-structure constant α for testing modern physical theories beyond the Standard Model 15 . A number of candidates for HCI clocks have been proposed [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] , and their transition wavelengths have been experimentally investigated [32][33][34][35] . Micke et al recently demonstrated quantum logic spectroscopy of HCIs using Ar 13+ , which has no hyperfine structure, promising realization of the HCI clocks 36,37 .…”

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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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confidence: 99%

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

et al. 2023

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“…As discussed in previous studies [26,37,39,40,[55][56][57], the strong visible lines observed in Tokamak or EBIT plasma mostly come from the low-lying states of the targeted ions, since these states are largely populated. Thus, in this work we focus on the 30 energy levels belonging to the three lowest configurations 4𝑓 14 5𝑠 2 5𝑝 4 , 4𝑓 13 5𝑠 2 5𝑝 5 and 4𝑓 12 5𝑠 2 5𝑝 6 .…”

Section: Theoretical Calculationsmentioning

confidence: 62%

Visible spectra of W8+ in an electron-beam ion trap

Yan

et al. 2021

Phys. Rev. A

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To provide spectroscopic data for lowly charged tungsten ions relevant to fusion research, this work focuses on the W 8+ ion. Six visible spectra lines from W 8+ in the range of 420-660 nm are observed with a compact electron-beam ion trap in Shanghai. Furthermore, transition energies are calculated for the 30 lowest levels of the 4𝑓 14 5𝑠 2 5𝑝 4 , 4𝑓 13 5𝑠 2 5𝑝 5 and 4𝑓 12 5𝑠 2 5𝑝 6 configurations of W 8+ by using the flexible atomic code (FAC) and GRASP package, respectively. Reasonably good agreement is found between our two independent atomic-structure calculations. The resulting atomic parameters are adopted to simulate the spectra based on the collisional-radiative model implemented in the FAC code. This assists us with identification of six strong magnetic dipole transitions in the 4𝑓 13 5𝑠 2 5𝑝 5 and 4𝑓 12 5𝑠 2 5𝑝 6 configurations from our experiments.

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“…The total wavelength uncertainty of this observation and calibration scheme was approximately 2 pm, which was comparable to the uncertainty of the scheme that the measured lines were calibrated by the lines from the buffer gas observed by a similar resolution spectrograph [44,45], but larger than the uncertainty of the scheme that the calibration source was overlapped with the real image of the ion observed by a higher resolution spectrograph [42]. Compared to these two schemes, our scheme is more convenient and flexible.…”

Section: Measurement Uncertaintiesmentioning

confidence: 69%

Probing Multiple Electric Dipole Forbidden Optical Transitions in Highly Charged Nickel Ions

Liang,

Zhang,

Guan

et al. 2021

Preprint

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Direct determination of the energy of the first excited fine-structure level in Ba6+

Cited by 21 publications

References 32 publications

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

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

Visible spectra of W8+ in an electron-beam ion trap

Probing Multiple Electric Dipole Forbidden Optical Transitions in Highly Charged Nickel Ions

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