Precision Measurements of the 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:msup><mml:mrow><mml:mi>Ba</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>138</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>
 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>6</mml:mn><mml:mi>s</mml:mi><mml:msub><mml:mrow

Arnold, K. J.; Kaewuam, R.; Chanu, Sapam Ranjita; Tan, Ting Rei; Zhang, Zhiqiang; Barrett, M. D.

doi:10.1103/physrevlett.124.193001

Cited by 17 publications

(6 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The resulting ac Zeeman shift depends on the magnitude and orientation of the ac field relative to the applied dc field and could potentially have a spatial variation along the ion crystal. This was investigated using the method in [19]. Measurements were carried out on three 138 Ba + ions, un- der three orthogonal orientations of the applied dc field.…”

Section: Systematicsmentioning

confidence: 99%

See 1 more Smart Citation

Precision measurement of the $^3D_1$ and $^3D_2$ quadrupole moments in Lu$^+$

Kaewuam,

Tan,

Zhang

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

Precision measurements of the Lu + 3 D1 and 3 D2 quadrupole moments have been carried out giving Θ( 3 D1) = 0.63862(74) ea 2 0 and Θ( 3 D2) = 0.8602( 14) ea 2 0 , respectively. The measurements utilize the differential shift between ions in a multi-ion crystal so that effects of external field gradients do not contribute leaving only the well defined Coulomb interaction. At this level of precision, hyperfinemediated corrections will likely be important.

show abstract

Section: Systematicsmentioning

confidence: 99%

“…Amplitudes of the ac magnetic field components for each ion measured with a three-ion crystal of 138 Ba + ions using the method presented in[19]. Values are given in µT.…”

mentioning

confidence: 99%

Precision measurement of the $^3D_1$ and $^3D_2$ quadrupole moments in Lu$^+$

Kaewuam,

Tan,

Zhang

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Optical ion clocks based on 40 Ca + [14-16], 88 Sr + [9,17], 138 Ba + [18], and 172 Yb + [19] employ clock states with I = 0 and J = 0, with F = J by consequence. J = 0 implies that the electron cloud lacks spherical symmetry and, thus, is susceptible to nonscalar perturbations.…”

mentioning

confidence: 99%

Prospects of a Pb$^{2+}$ ion clock

Beloy

2021

Preprint

View full text Add to dashboard Cite

We propose a high-performance atomic clock based on the 1.81 PHz transition between the ground and first-excited state of doubly ionized lead. Utilizing an even isotope of lead, both clock states have I = J = F = 0, where I, J, and F are the conventional quantum numbers specifying nuclear, electronic, and total angular momentum, respectively. The clock states are nondegenerate and completely immune to nonscalar perturbations, including first order Zeeman and electric quadrupole shifts. Additionally, the proposed clock is relatively insusceptible to other frequency shifts (blackbody radiation, second order Zeeman, Doppler), accommodates "magic" rf trapping, and is robust against decoherence mechanisms that can otherwise limit clock stability. By driving the transition as a two-photon E1+M 1 process, the accompanying probe Stark shift is appreciable yet manageable for practical Rabi frequencies.

show abstract

“…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]. Chapter 5…”

Section: Resultsmentioning

confidence: 99%

“…101 on assessing the differential polarizability. A first precision measurement of a Ba + clock transition has very recently appeared on arXiv [102].…”

Section: Current Statusmentioning

confidence: 99%

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

Dijck

View full text Add to dashboard Cite

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.

show abstract

Precision Measurements of the Ba+138 6s

Cited by 17 publications

References 36 publications

Precision measurement of the $^3D_1$ and $^3D_2$ quadrupole moments in Lu$^+$

Precision measurement of the $^3D_1$ and $^3D_2$ quadrupole moments in Lu$^+$

Prospects of a Pb$^{2+}$ ion clock

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

Contact Info

Product

Resources

About