Accurate measurements of transition frequencies and isotope shifts of laser-trapped francium.
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.
Sanguinetti
S
S
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
Calabrese
R
R
Corradi
L
L
Dainelli
A
A
Khanbekyan
A
A
Mariotti
E
E
de Mauro
C
C
Minguzzi
P
P
Moi
L
L
Stancari
G
G
Tomassetti
L
L
Veronesi
S
S