Our measurements of transition frequencies and isotope shifts of all stable barium isotopes in the D1 and D2 transitions have been published in Physical Review A. To our knowledge, these are the most precise collinear measurements performed so far. Our result for the transition frequency of Ba-138 is even slightly more accurate than a recent measurement on laser-cooled ions in a Paul trap. Herewith we have established our COALA beamline not only as a unique instrument for high-voltage measurements, but also for highly accurate laser spectroscopic investigations.
Please read more in the article “Collinear laser spectroscopy at ion-trap accuracy: Transition frequencies and isotope shifts in the 6s2S1/2 → 6p2P1/2,3/2 transitions in Ba+”.