Part-per-billion measurement of the $4^2{S}_{1/2}\to 3^2{D}_{5/2}$ electric quadrupole transition isotope shifts between ${}^{42,44,48}$Ca${}^{+}$ and ${}^{40}$Ca${}^{+}$

Felix W. Knollmann, Ashay N. Patel, S. Charles Doret

We report a precise measurement of the isotope shifts in the $4^2$S${}_{1/2}\to 3^2$D${}_{5/2}$ electric quadrupole transition at 729~nm in the ${}^{40-42,44,48}$Ca${}^{+}$. The m…