V. Barbé

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physics.atom-ph2026

Extreme-ultraviolet spectroscopy using quantum logic: a feasibility study for singly-ionized helium

A. Martínez de Velasco, V. P. J. Barbé, E. L. Gründeman +10

Extreme-ultraviolet (XUV) spectroscopy represents an important new direction in precision physics, with potential applications ranging from the metrology of fundamental constants t…

physics.atom-ph2026

Spectroscopy of the Hyperfine Structure of HD $^{+}$ in Rotationally Excited States with 10-ppb Uncertainty

D. Kliukin, V. BarbÃ©, T. Klijn Velderman +5

We report the first measurement of the total hyperfine interval in the manifold of the ( $v = 0, L = 3$ ) rovibrational state of HD $^{+}$ using microwave spectroscopy of HD $^{+}$ ions in a li…

physics.atom-ph2026

An Al $^{+}$ clock with $1.6 \times 1 0^{- 18}$ systematic uncertainty and its frequency ratios

Fabian Dawel, Johannes Kramer, Derwell Drapier +15

Advances in optical clocks motivate a redefinition of the second, requiring rigorous evaluations of systematic uncertainties and robust consistency among the clocks. Here, we repor…

Extreme-ultraviolet spectroscopy using quantum logic: a feasibility study for singly-ionized helium

Spectroscopy of the Hyperfine Structure of HD+ in Rotationally Excited States with 10-ppb Uncertainty

An Al+ clock with 1.6×10−18 systematic uncertainty and its frequency ratios

Spectroscopy of the Hyperfine Structure of HD $^{+}$ in Rotationally Excited States with 10-ppb Uncertainty

An Al $^{+}$ clock with $1.6 \times 1 0^{- 18}$ systematic uncertainty and its frequency ratios