Isotope-shift spectroscopy of the ${}^1{S}_0\to {}^3{P}_1$ and ${}^1{S}_0\to {}^3{P}_0$ transitions in strontium

Abstract

Isotope shift spectroscopy with narrow optical transitions provides a benchmark for atomic structure calculations and has also been proposed as a way to constrain theories predicting physics beyond the Standard Model. Here, we have measured frequency shifts of the ${}^1{S}_0\to {}^3{P}_1$ and ${}^1{S}_0\to {}^3{P}_0$ transitions between all stable isotopes of strontium relative to ${}^{88}$Sr. This includes the first reported measurements of the ${}^1{S}_0\to {}^3{P}_0$ isotope shift of ${}^{88}$Sr-${}^{86}$Sr and ${}^{88}$Sr-${}^{84}$Sr. Using the isotope shift measurements of the two transitions, a King plot analysis is performed. These results, combined with other recent isotope shift measurements in other atomic systems, will help refine atomic structure calculations and theoretical predictions for new physics.

9 pages, 4 figures, 3 tables