Lifetime Measurement of the 8s Level in Francium

Abstract

We measure the lifetime of the 8s level on a magneto-optically trapped sample of ^{210}Fr atoms with time-correlated single-photon counting. The 7P_{1/2} 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 7P_{3/2} level gives 53.30 +- 0.44 ns for the 8s level lifetime.

arXiv comment4 pages, 4 figures

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• Relativistic many-body calculations of energy levels, hyperfine constants, electric-dipole matrix elements and static polarizabilities for alkali-metal atoms
• Calculations of parity nonconserving s-d transitions in Cs, Fr, Ba II, and Ra II
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• Magic and tune-out wavelengths for atomic francium
• Multiple Isotope Magneto Optical Trap from a single diode laser
• Electric dipole transition amplitudes for atoms and ions with one valence electron
• Properties of Fr-like Th3+ from spectroscopy of high-L Rydberg levels of Th2+
• Measurement of the lifetime of the $7s^2{S}_{1/2}$ state in atomic cesium using asynchronous gated detection
• Measurement of the Ra${}^{+}$ $7p$ ${}^2{P}_{3/2}$ state lifetime