Ground-state binding energy of berylliumlike molybdenum: correlation and quantum-electrodynamics effects

High-precision calculations of the ground-state binding energy of berylliumlike molybdenum ($Z$ = 42) are performed. The applied approach merges rigorous quantum-electrodynamics (QED) treatment up to the second order of perturbation theory in the framework of the Furry picture and the third- and higher-order correlation effects evaluated within the Breit approximation. The mixing of the close configurations of the same symmetry due to the electron–electron interaction is considered by employing the QED perturbation theory for quasi-degenerate levels. The most accurate up-to-date theoretical predictions for the binding energy are obtained.