Measurement of the lifetime of the $7s^2{S}_{1/2}$ state in atomic cesium using asynchronous gated detection

Abstract

We report a measurement of the lifetime of the cesium $7s{}^2{S}_{1/2}$ state using time-correlated single-photon counting spectroscopy in a vapor cell. We excite the atoms using a Doppler-free two-photon transition from the $6s{}^2{S}_{1/2}$ ground state, and detect the 1.47$\mu$m photons from the spontaneous decay of the $7s{}^2{S}_{1/2}$ to the $6p{}^2{P}_{3/2}$ state. We use a gated single photon detector in an asynchronous mode, allowing us to capture the fluorescence profile for a window much larger than the detector gate length. Analysis of the exponential decay of the photon count yields a $7s{}^2{S}_{1/2}$ lifetime of 48.28$\pm$0.07ns, an uncertainty of 0.14%. These measurements provide sensitive tests of theoretical models of the Cs atom, which play a central role in parity violation measurements.

arXiv comment5 pages, 5 figures, 2 tables

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Cited by in corpus (5)

• Determination of the scalar and vector polarizabilities of the cesium $6s{}^2{S}_{1/2}\to 7s{}^2{S}_{1/2}$ transition and implications for atomic parity non-conservation
• Measurement of the radial matrix elements for the $6s^2{S}_{1/2}\to 7p^2{P}_J$ transitions in cesium
• Electric dipole matrix elements for the $6p{}^2{P}_J\to 7s{}^2{S}_{1/2}$ transition in atomic cesium
• Lifetime Measurements of the $A^2{\Pi }_{1/2}$ and $A^2{\Pi }_{3/2}$ States in BaF
• Electric dipole transition amplitudes for atoms and ions with one valence electron