Lifetime measurement of the 9s level of atomic francium
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abstract
Two-photon resonant excitation and time-correlated single-photon counting techniques were used on a sample of 210Fr atoms confined and cooled in a magneto-optical trap to measure the lifetime of the 9s excited level. Direct measurement of the decay through the 7P3/2 level at 851 nm yielded a lifetime of 107.53 ± 0.80 ns.
