Blackbody radiation shift assessment for a lutetium ion clock

Abstract

We measure the dynamic differential scalar polarizabilities at 10.6 $\mu$m for two candidate clock transitions in ${}^{176}{\mathrm{Lu}}^{+}$. The fractional black body radiation (BBR) shifts at 300 K for the ${}^1{S}_0\leftrightarrow {}^3{D}_1$ and ${}^1{S}_0\leftrightarrow {}^3{D}_2$ transitions are evaluated to be $-1.36(9)\times 10^{-18}$ and $2.70(21)\times 10^{-17}$, respectively. The former is the lowest of any established optical atomic clock.

6 pages, 4 figures