Isotope shifts and hyperfine structure in the [formula omitted][formula omitted] transitions of stable calcium isotopes and calcium-41

Abstract

Isotope shifts and hyperfine structure in the 4s 2 1S 0 → 4s4p 1P 1 and 4s 2 1S 0 → 4s4d 1D 2 transitions of calcium have been measured with high-precision laser spectroscopy. Calcium atoms in an atomic beam were excited with single-frequency cw dye and titanium sapphire lasers and then photoionized with the 363.8 nm or 514.5 nm line of an argon ion laser. The resulting ions were analyzed and detected with a quadrupole mass spectrometer. Isotope shifts for all stable calcium isotopes and the radionuclide 41Ca have been measured in both transitions. The corresponding field shift and specific mass shift coefficients as well as hyperfine structure constants for the isotopes 41, 43Ca have been derived. The results are compared with previous work and values for 41,43,46Ca in the 4s4d 1D 2 state are reported for the first time.