Lifetime measurement of the metastable 4d 2D 5/2 state in 88Sr+ using a single trapped ion

Physics

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Oscillator Strengths, Lifetimes, Transition Moments, Atomic And Molecular Data, Spectra, And Spectral Parameters, Optical Cooling Of Atoms, Trapping, Quantum Fluctuations, Quantum Noise, And Quantum Jumps

Scientific paper

The natural lifetime of the metastable 4dD5/22 state in Sr+88 has been measured using a single laser-cooled, trapped ion. The ion was prepared in the 4dD5/22 state by laser excitation of the 5sS1/22-4dD5/22 quadrupole transition at 674 nm. The decay time was measured by using Dehmelt’s electron shelving method to monitor the ion’s electronic state. Two separate investigations were conducted under slightly different experimental conditions. 160 000 decay times from the 4dD5/22 state were observed in total, and two different methods for determining the statistical value of the measured lifetime have been compared. Systematic effects have also been estimated, and including these effects yields a value of τ=390.8(1.6)ms ( 1σ uncertainty) for the natural lifetime.

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