Collinear laser spectroscopy at ion-trap accuracy: Transition frequencies and isotope shifts in the 
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Imgram, Phillip; König, Kristian; Krämer, Jörg; Ratajczyk, Tim; Müller, R. A.; Surzhykov, A.; Nörtershäuser, W.

doi:10.1103/physreva.99.012511

Cited by 24 publications

(16 citation statements)

References 48 publications

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“…This work improved upon the earlier measurements by more than two orders of magnitude. Since publishing, a new measurement of the 6s 2 S 1/2 -6p 2 P 1/2 transition has appeared [161] that is consistent with our result. Very recently an improved measurement of the 6s 2 S 1/2 -5d 2 D 5/2 clock transition has been put on arXiv [102].…”

Section: Resultssupporting

confidence: 90%

Spectroscopy of Trapped ¹³⁸Ba⁺ Ions for Atomic Parity Violation and Optical Clocks

Dijck

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Trapped Ba + and Ra + ions offer the possibility to test the Standard Model by performing an independent high-precision determination of the Weinberg angle (sin 2 θ W) at low momentum transfer. In such a measurement of atomic parity violation, table-top experiments complement studies of weak interaction effects at high energy in the search for new physics. The singly-charged heavy alkaline earth metal ions combine high intrinsic sensitivity with tractable atomic structure owing to their single valence electron. In addition, trapped Ba + or Ra + ions can serve as reference for an optical atomic clock that is sensitive to variation of the fine structure constant α. Determining sin 2 θ W requires localizing a single laser-cooled Ba + or Ra + ion in a standing-wave light field to a fraction of an optical wavelength. High-precision atomic theory calculations are crucial for interpreting the measurements and need experimental input. We have performed preparatory spectroscopy measurements with trapped Ba + ions and investigated experimental techniques for characterizing ion traps. We have determined the optical transition frequencies between low-lying levels of 138 Ba + with laser spectroscopy referenced to an optical frequency comb. Using a lineshape model based on eight-level optical Bloch equations, we determined the 6s 2 S 1/2-5d 2 D 3/2 transition frequency to be 146 114 384.0(0.1) MHz and the 5d 2 D 3/2-6p 2 P 1/2 transition frequency to be 461 311 878.5(0.1) MHz, obtaining for the first time sub-MHz precision on these transitions. Light shifts play an important role in the measurement of sin 2 θ W and offer a way to obtain information on (ratios of) atomic transition matrix elements. We have carried out an exploratory study of the light shift in 138 Ba + caused by an off-resonant laser tuned close to the 5d 2 D 3/2-6p 2 P 1/2 transition. The observed spectra are analyzed by combining the optical lineshapes with calculated light shifts of individual Zeeman components. Atomic state lifetimes provide a benchmark for calculations of transition amplitudes. We have measured the lifetime of the long-lived 5d 2 D 5/2 level in 138 Ba + using a technique based on quantum jumps with one to four trapped ions. We have investigated known systematic effects in detail to evaluate their influence. We measured the lifetime of the 5d 2 D 5/2 level to be 26.3(0.6) s, which is about 4σ shorter than previously published experimental results. This discrepancy needs to be clarified to ensure the reliability of atomic parity violation measurements ahead. This work contributes toward a precise determination of sin 2 θ W with trapped Ba + or Ra + ions in search of physics beyond the Standard Model.

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Section: Resultssupporting

confidence: 90%

Spectroscopy of Trapped ¹³⁸Ba⁺ Ions for Atomic Parity Violation and Optical Clocks

Dijck

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“…Nowadays, precise measurements of absolute transition frequencies and isotope shifts in ions are also performed to benchmark atomic theory and to support on-line investigations of shortlived isotopes. For this purpose, a cw laser system based on Ti:sapphire lasers combined with Wavetrain frequency doublers is available alongside a GPS-referenced frequency comb to determine and stabilize its frequency [1,26,27].…”

Section: B Wsx-frequency Comb Comparisonmentioning

confidence: 99%

On the performance of wavelength meters: Part 1—consequences for medium-to-high-resolution laser spectroscopy

et al. 2020

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“…In order to equip our collinear beamline COALA (COllinear Apparatus for Laser spectroscopy and Applied science) at TU Darmstadt [24][25][26] with a versatile ion source that will also serve the LASPEC experiment at FAIR [27], we are currently developing a laserablation ion source. The source is designed to reduce necessary DC fields to a minimum, but maintaining a high transport efficiency by He gas flow.…”

Section: Introductionmentioning

confidence: 99%

Towards a He-buffered laser ablation ion source for collinear laser spectroscopy

et al. 2020

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Laser ablation opens a material-independent method to produce ions from transition metals for laser spectroscopy. To overcome some drawbacks of this process, an ion source is under development at TU Darmstadt. A distinctive feature of this source is that ions are produced via laser ablation in presence of helium buffer gas where they stop and cool in the process of their collisions with the buffer gas atoms and are then extracted by the gas flow into low-pressure conditions through the supersonic nozzle. The compact RF-only funnel ion guide placed on the axis behind the nozzle exit allows for effective extraction of highquality ion beams into a pressure region below 10 −4 mbar. The extraction is realized by using the gas flow trough a supersonic nozzle and an RF-only funnel ion guide, followed by a second nozzle and an RF+DC funnel representing two differential pumping stages. The technical details of this laser ablation ion source are described and the results of the first tests with the RF-only funnel are presented.

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Collinear laser spectroscopy at ion-trap accuracy: Transition frequencies and isotope shifts in the 6s2S1/2→6p2

Cited by 24 publications

References 48 publications

Spectroscopy of Trapped ¹³⁸Ba⁺ Ions for Atomic Parity Violation and Optical Clocks

Spectroscopy of Trapped ¹³⁸Ba⁺ Ions for Atomic Parity Violation and Optical Clocks

On the performance of wavelength meters: Part 1—consequences for medium-to-high-resolution laser spectroscopy

Towards a He-buffered laser ablation ion source for collinear laser spectroscopy

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