We describe the laser cooling of Ca(+) ions in a rf ion trap and the measurement of its 3(2)D(5/2) state lifetime. The ions are cooled to below 1 K by radiation from a frequency-doubled Ti:sapphire laser and a laser diode. The radiative lifetime is measured by observing the change in fluorescence when the ions, which are optically pumped to the metastable state, return to the cooling cycle. The lifetime of the 3(2)D(5/2) state is measured to be 0.77 +/- 0.07 s.

Optics LettersAug 15, 199228 citations

Identification of the lowest metastable autoionizing level in Rb from rf spectroscopic studies

Robert Novick, G. F. Sprott, Thomas B. Lucatorto

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European Conference on Atomic Physics

Laser-Rf Double-Resonance Hyperfine Structure Measurements of the Metastable (3d4s) 1 D 2 State of 43 Ca

Remzi Aydın, Wolfgang A. Ertmer, Ulrich A. Johann

Published Jan 1, 1981• 0 citations

OpenAlex

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The lowest Rb metastable autoionizing level has been identified by a rf resonance measurement of the g factors of the various hyperfine sublevels. Of the two lowest-lying metastable state assignments, $4{p}^{5}(^{2}P)5s5p(^{3}P)^{4}D_{\frac{7}{2}}$ and $4{p}^{5}4d(^{3}F)5s^{4}F_{\frac{9}{2}}$ , only components of the $^{4}D_{\frac{7}{2}}$ were observed in the metastable beam. The atomic-beam resonance method employed resembles traditional methods except that it exploits the differential metastability of the fine-structure levels instead of magnetic deflection for state selection.The lowest Rb metastable autoionizing level has been identified by a rf resonance measurement of the g factors of the various hyperfine sublevels. Of the two lowest-lying metastable state assignments, $4{p}^{5}(^{2}P)5s5p(^{3}P)^{4}D_{\frac{7}{2}}$ and $4{p}^{5}4d(^{3}F)5s^{4}F_{\frac{9}{2}}$, only components of the $^{4}D_{\frac{7}{2}}$ were observed in the metastable beam. The atomic-beam resonance method employed resembles traditional methods except that it exploits the differential metastability of the fine-structure levels instead of magnetic deflection for state selection.

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An ``amplitude model'' of the laser-rf double-resonance process has been quantitatively verified, providing a complete explanation of the anomalous line shapes observed in studies of

{\mathrm{Na}}_{2}

hyperfine structure. We find excellent agreement with new laser-rf double-resonance measurements in low-J'' rotational levels of the

{X}^{1}

${\ensuremath{\Sigma}}_{g}^{+}$(v''=0) ground state of

{\mathrm{Na}}_{2}

as well as with earlier data for J''=28. These results confirm the idea that absorption and stimulated-emission Rabi cycles in the presence of the laser field create coherence between the ground-state hyperfine levels when these levels are optically unresolved. A novel ground-state ``quantum beat'' experiment is proposed.

4{p}^{5}(^{2}P)5s5p(^{3}P)^{4}D_{\frac{7}{2}}

and

4{p}^{5}4d(^{3}F)5s^{4}F_{\frac{9}{2}}

, only components of the

^{4}D_{\frac{7}{2}}

were observed in the metastable beam. The atomic-beam resonance method employed resembles traditional methods except that it exploits the differential metastability of the fine-structure levels instead of magnetic deflection for state selection.