Abstract
The isotopic frequency shift for the 3P 1- 3P 0Δ m j =0 fine structure transition in the first metastable triplet of 24Mg and 26Mg is reported. The transitions corresponding to the two even isotopes of Mg have been observed via the fluorescence emission at 4571 Å of the intercombination line 3P 1- 1P 0 in a metastable atomic beam. The center frequencies have been measured with an uncertainty of 7×10 -9; the isotopic shift turned out to be 1706 ± 2 kHz.
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