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Opt Lett. 2009 Apr 1;34(7):893-5.

Accurate measurements of transition frequencies and isotope shifts of laser-trapped francium.

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  • 1Consorzio Nazionale Interuniversitario per le Scienze Fisiche della-Unità di Pisa, Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy.


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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