Intercombination line frequencies in ${}^{171}$Yb validated with the clock transition

Daniel M. Jones, Frank van Kann, John J. McFerran

We have carried absolute frequency measurements of the $(6s^2){}^1{S}_0$ $-$ $(6s6p){}^3{P}_1$ transition in ${}^{171}$Yb (the intercombination line), where the spin-1/2 isotop…