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Opt Lett. 1996 Dec 1;21(23):1939-41.

7S(1/2) ? 9S(1/2) two-photon spectroscopy of trapped francium.


We report on the spectroscopic measurement of the (210)Fr 9S(1/2) energy obtained by two-photon excitation of atoms confined and cooled in a magneto-optic trap. The resonant intermediate level 7P(3/2) is the upper state of the trapping transition. We have measured the energy difference between the 9S(1/2) state and the 7S(1/2) ground state to be 25 671.021 +/- 0.006 cm(-1).


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