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. 2015 Dec 7;5:17495. doi: 10.1038/srep17495

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Left panel: evaluation of the quadratic Zeeman shift in Sr2. The second order Zeeman correction depends on the absolute value of the magnetic field therefore similar measurements are made in all three directions B₀ = 2.383 mT corresponds to the applied B-field inducing clock transition at standard operating conditions. Right panel: evaluation of the probe light shift in Sr2. I₀ = 488 mW/cm² corresponds to the clock laser intensity at standard operating conditions.