K. J. Arnold

collaborators

8 papers

physics.atom-ph2026

Measurement of the reduced dipole matrix element in Ba $^{+}$

N. Jayjong, M. D. K. Lee, K. J. Arnold +1

We present a high-precision measurement of the reduced electric-dipole matrix element $⟨ P_{1/2} ∥ r ∥ S_{1/2} ⟩$ in $^{138} Ba^{+}$ . By comparing off-resonant scatt…

physics.atom-ph2026

Absolute frequency measurement of the $^{176}$ Lu $^{+} (^{3} D_{1})$ standard against the NRC-FCs2 fountain with $2.6 \times 1 0^{- 16}$ uncertainty

K. J. Arnold, Bin Jian, Zhao Zhang +6

We report an improved absolute frequency measurement of the $^{176}$ Lu $^{+} (^{3} D_{1})$ optical frequency standard, evaluated via a remote link to the NRC-FCs2 caesium fount…

physics.atom-ph2026

Zero crossings of the differential scalar polarizability of Ba $^{+}$ clock transition

N Jayjong, M D K Lee, K J Arnold +1

The differential scalar polarizability $I^ I^\pm_{0} (I ¨ )$ of the Ba $^{+}$ S $_{1/2}$ -to-D $_{5/2}$ clock transition has a zero crossing near 481nm, which is measured to be 623.603\,13(17)\,T…

physics.atom-ph2026

Analysis of collision shift assessments in ion-based clocks

M. D. Barrett, K. J. Arnold

We consider back-ground gas collision shifts in ion-based clocks. We give both a classical and quantum description of a collision between an ion and a polarizable particle with a s…

physics.atom-ph2025

Optical clocks with accuracy validated at the 19th digit

K. J. Arnold, M. D. K. Lee, Zhao Qi +4

We report a comprehensive evaluation of all known sources of systematic uncertainty for two independent $^{176}$ Lu $^{+}$ single-ion optical references, finding total systematic uncer…

physics.atom-ph2025

Precision measurement of the $^{176} Lu^{+}$ $^{3} D_{1}$ microwave clock transitions

M. D. K. Lee, Qi Zhao, Qin Qichen +4

We report precision measurement of the unperturbed $^{3} D_{1}$ microwave transition frequencies in $^{176} Lu^{+}$ to a fractional uncertainty of $4 \times 1 0^{- 14}$ . We find t…

Measurement of the reduced dipole matrix element in Ba+

Absolute frequency measurement of the 176Lu+(3D1​) standard against the NRC-FCs2 fountain with 2.6×10−16 uncertainty

Zero crossings of the differential scalar polarizability of Ba+ clock transition

Analysis of collision shift assessments in ion-based clocks

Optical clocks with accuracy validated at the 19th digit

Precision measurement of the 176Lu+ 3D1​ microwave clock transitions

Measurement of the reduced dipole matrix element in Ba $^{+}$

Absolute frequency measurement of the $^{176}$ Lu $^{+} (^{3} D_{1})$ standard against the NRC-FCs2 fountain with $2.6 \times 1 0^{- 16}$ uncertainty

Zero crossings of the differential scalar polarizability of Ba $^{+}$ clock transition

Precision measurement of the $^{176} Lu^{+}$ $^{3} D_{1}$ microwave clock transitions