Sanguinetti S, Calabrese R, Corradi L, Dainelli A, Khanbekyan A, Mariotti E, de Mauro C, Minguzzi P, Moi L, Stancari G, Tomassetti L, Veronesi S. Accurate measurements of transition frequencies and isotope shifts of laser-trapped francium.
Opt Lett 2009;
34:893-895. [PMID:
19340162 DOI:
10.1364/ol.34.000893]
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Abstract
An interferometric method is used to improve the accuracy of the 7S-7P transition frequencies of three francium isotopes by 1 order of magnitude. The deduced isotope shifts for 209-211Fr confirm the ISOLDE data. The frequency of the D2 transition of 212Fr--the accepted reference for all Fr isotope shifts--is revised, and a significant difference with the ISOLDE value is found. Our results will be a benchmark for the accuracy of the theory of Fr energy levels, a necessary step to investigate fundamental symmetries.
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