Isotope-shift measurement of the 62S1/2–52D5/2transition inBa+

Abstract

The isotope shifts of the 6 ${}_{}{}^2{}_{}{}^{}$ ${\mathit{S}}_{1/2}$–5 ${}_{}{}^2{}_{}{}^{}$ ${\mathit{D}}_{5/2}$ transition in ${\mathrm{Ba}}^{+}$ have been measured using the high-resolution laser spectroscopy of a single trapped ion. The shifts are measured among three even ${\mathrm{Ba}}^{+}$ isotopes, ${}_{}{}^{138}{}_{}{}^{}\mathrm{Ba}_{}^{+}{}_{}{}^{}$, ${}_{}{}^{136}{}_{}{}^{}\mathrm{Ba}_{}^{+}{}_{}{}^{}$, and ${}_{}{}^{134}{}_{}{}^{}\mathrm{Ba}_{}^{+}{}_{}{}^{}$. The results are ${\nu }_{138\mathrm{-}}$ ${\nu }_{136}$=-106.143(4) MHz and ${\nu }_{138\mathrm{-}}$ ${\nu }_{134}$=-38.455(15) MHz. This experiment gives a measurement of isotope shifts for a heavy atom. The results should provide a stringent test for the theoretical calculations of the isotope shifts of alkali-metal-like atoms.