The absolute frequency of the 4 2 S 1/2 –3 2 D 5/2 optical clock transition of 40 Ca + ions has been measured for the first time with respect to the Système International (SI) second. A single 40 Ca + ion is laser-cooled in a small ion trap and the transition frequency is measured as the average of two symmetrical Zeeman components. The frequency is determined to be 411 042 129 776 385 (±18) Hz from 48 measurements.
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Matsubara et al. (2008) studied this question.
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