Calculation of isotope shifts and King plot nonlinearities in Ca${}^{+}$

Anna V. Viatkina, Vladimir A. Yerokhin, Andrey Surzhykov

Many-body perturbation theory is implemented in order to calculate the isotope shifts of $4s$, $4p_{1/2}$, $4p_{3/2}$, $3d_{3/2}$, and $3d_{5/2}$ energy levels of Ca${}^{+}$, for even…