Physical Review A
We observe the electric-dipole forbidden 7s→8s transition in the francium isotopes 208−211Fr and 213Fr using a two-photon excitation scheme. We collect the atoms online from an accelerator and confine them in a magneto-optical trap for the measurements. In combination with previous measurements of the 7s→7p1/2 transition we perform a King plot analysis. We compare the thus-determined ratio of the field shift constants (1.228 ± 0.019) to results obtained from new ab initio calculations (1.234 ± 0.010).
Kalita, M. R.; Behr, J. A.; ...; Aubin, Seth; and al., et, Isotope Shifts in the 7 s → 8 s Transition of Francium: Measurements and Comparison to ab initio Theory (2018). Physical Review A, 97(4).
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