Lifetime Measurement of the 8s Level in Francium
Abstract
We measure the lifetime of the 8s level on a magneto-optically trapped sample of 210Fr atoms with time-correlated single-photon counting. The 7P1/2 state serves as the resonant intermediate level for two-photon excitation of the 8s level completed with a 1300 nm laser. Analysis of the fluorescence decay through the the 7P3/2 level gives 53.30 +- 0.44 ns for the 8s level lifetime.
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