Lifetime measurement of the 9s level of atomic francium.
We use two-photon resonant excitation and time-correlated single-photon counting techniques 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 7P(3/2) level at 851 nm yields a lifetime of 107.53 +/- 0.80 ns.
Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800, USA.
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Aubin
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Gomez
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Orozco
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Sprouse