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Measurement of the hyperfine structure of the S1/2-D5/2 transition in 43Ca+

J. Benhelm·G. Kirchmair·U. Rapol·T. Koerber·C. F. Roos·R. Blatt
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Abstract

The hyperfine structure of the S1/2-D5/2 quadrupole transition at 729 nm in 43Ca+ has been investigated by laser spectroscopy using a single trapped 43Ca+ ion. We determine the hyperfine structure constants of the metastable level as A=-3.8931(2) MHz and B=-4.241(4) MHz. The isotope shift of the transition with respect to 40Ca+ was measured to be 4134.713(5) MHz. We demonstrate the existence of transitions that become independent of the first-order Zeeman shift at non-zero low magnetic fields. These transitions might be better suited for building a frequency standard than the well-known 'clock transitions' between m=0 levels at zero magnetic field.

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J. Benhelm, G. Kirchmair, U. Rapol, T. Koerber, C. F. Roos, R. Blatt. 2006-11-14. Measurement of the hyperfine structure of the S1/2-D5/2 transition in 43Ca+. https://doi.org/10.1103/physreva.75.032506

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