Relativistic and many-body effects on total binding energies of cesium ions - art. no. 012510

Total binding energies of several charge states of cesium, including all ra re-gas configurations, are calculated in the framework of relativistic many -body perturbation theory and the multiconfiguration Dirac-Fock method. Ne do a detailed comparison of the correlations obtained by these two methods, from which we can obtain information on the accuracy of the predictions. W e thus provide benchmark calculations to assess how accurately atomic masse s can be deduced from highly charged ions, for both present and future Penn ing-trap experiments. One-electron radiative corrections are included and t he screening of the self-energy is evaluated using the Welton approximation .