Applied Optics

Lifetime measurement of the NaI 4d level using the selective excitation of fast ion beams by a laser

Siham A. Kandela

Published Jul 1, 1984• 5 citations

Abstract

The technique of stepwise excitation of a fast ion beam is used for lifetime measurements. The 42D level of a sodium atom in a fast beam is populated by the gas laser two-step excitation process. The lifetime is determined from the single decay curve of the fluorescence light intensity downstream. The result obtained for the NaI 4d level is 50.7 ± 0.5 nsec.

DOI: 10.1364/ao.23.002152

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Applied Optics

Lifetime measurement of the NaI 4d level using the selective excitation of fast ion beams by a laser

Siham A. Kandela

Published Jul 1, 1984• 5 citations

Publisher

Abstract

DOI: 10.1364/ao.23.002152

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^{6}

{\mathit{K}}_{9/2}

level to the (23 537)${\mathrm{\ifmmode^\circ\else\textdegree\fi{}}}_{9/2}$ level by the light of a cw dye laser. The decay of the resonance fluorescence photons emitted in the transition to the ground 4${\mathit{f}}^{4}$6s

^{6}

{\mathit{I}}_{7/2}

level, as a function of the flight distance, was observed. The decay length was scaled into the decay time by the ion velocity, which was determined using the optical resonance itself. The lifetime is 27.7(9) ns.

We provide a detailed description of our fast-beam laser lifetime measurements in atomic cesium. Selective excitation of the neutral

{}^{133}\mathrm{Cs}

6p{}^{2}{P}_{1/2}

and

6p{}^{2}{P}_{3/2}

states is accomplished with resonant diode laser light directed transversely to the atomic velocity. The in-flight decay of the excited-state fluorescence is observed with a position-correlated single photon-counting detector. The Doppler-shifted

6p{}^{2}{P}_{3/2}

resonance, when probed with longitudinally propagating laser radiation, provides a precise means for determination of the beam velocity, and converts the position scale to a time scale. Our lifetime results are $35.07\ifmmode\pm\else\textpm\fi{}0.10 \mathrm{ns}$ for the

6p{}^{2}{P}_{1/2}

state and $30.57\ifmmode\pm\else\textpm\fi{}0.07 \mathrm{ns}$ for the

6p{}^{2}{P}_{3/2}

state. These results represent a data set larger than in our previous work, and include beam divergence corrections which have been evaluated by two different methods. We present comparisons of our results with previous measurements and with relativistic many-body calculations of atomic transition matrix elements in this neutral alkali system.