Systematic-free limit on new light scalar bosons via isotope shift spectroscopy in Ca${}^{+}$

Timothy T. Chang, Bless Bah Awazi, Julian C. Berengut +2

We report a precise measurement of the isotope shifts in the $4^2$S${}_{1/2}\to 3^2$D${}_{3/2}$ electric quadrupole transition at 732~nm in ${}^{40-42,44,48}$Ca${}^{+}$ via high-r…