Relativistic and many-body effect on total binding energies of cesium and other highly-charged ions

The determination of atomic masses from highly ionized atoms using Penning Traps requires precise values for electronic binding energies. In the prese nt work, binding energies of several ions (from several elements) are calcu lated in the framework of two relativistic many-body methods: Relativistic Many-Body Perturbation Theory (RMBPT) and Multi-Configuration Dirac-Fock (M CDF). The ions studied in this work are: Cl (He and Li-like), Se (F and Ne- like), Cs (He, Be, Ne, Al, Cl, Ar, K, Kr, Xe-like and neutral Cs), Hg, Pb a nd U (Br and Kr-like). Some of them are presented in this paper. Cesium has been treated in more details, allowing for a systematic comparison between MCDF and RMBPT methods. The Cs ions binding energies allow for the determi nation of atomic Cs mass, which can be used in a QED-independent fine struc ture constant determination.