Abstract
With microkelvin neutral strontium atoms confined in an optical lattice, we have achieved a fractional resolution of better than 5×10–15 on the 1 S 0–3 P 0 doubly forbidden 87Sr clock transition at 698 nm. Measurements of the clock line shifts as a function of experimental parameters indicate that the fractional uncertainties due to systematic shifts could be reduced below 10–15. The ultrahigh spectral resolution permitted resolving the nuclear spin states of the clock transition at small magnetic fields, leading to measurements of the 3 P 0 magnetic moment and metastable lifetime. In addition, photoassociation spectroscopy was performed on the narrow 1 S 0–3 P 1 transition of 88Sr, revealing the least-bound state, and showing promise for efficient optical tuning of the ground state scattering length and production of cold molecules.
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Zelevinsky, T., Boyd, M.M., Ludlow, A.D. et al. Optical clock and ultracold collisions with trapped strontium atoms. Hyperfine Interact 174, 55–64 (2007). https://doi.org/10.1007/s10751-007-9564-x
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DOI: https://doi.org/10.1007/s10751-007-9564-x