title: Accurate measurements of transition frequencies and isotope shifts of laser-trapped francium.
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.
authors.affiliation: Consorzio Nazionale Interuniversitario per le Scienze Fisiche della-Unità di Pisa, Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy. stefano.sanguinetti@df.unipi.it
authors.forename: S
authors.initials: S
authors.lastname: Sanguinetti
authors.forename: R
authors.initials: R
authors.lastname: Calabrese
authors.forename: L
authors.initials: L
authors.lastname: Corradi
authors.forename: A
authors.initials: A
authors.lastname: Dainelli
authors.forename: A
authors.initials: A
authors.lastname: Khanbekyan
authors.forename: E
authors.initials: E
authors.lastname: Mariotti
authors.forename: C
authors.initials: C
authors.lastname: de Mauro
authors.forename: P
authors.initials: P
authors.lastname: Minguzzi
authors.forename: L
authors.initials: L
authors.lastname: Moi
authors.forename: G
authors.initials: G
authors.lastname: Stancari
authors.forename: L
authors.initials: L
authors.lastname: Tomassetti
authors.forename: S
authors.initials: S
authors.lastname: Veronesi