(2p(2))S-1 state of beryllium

The (2p(2))S-1 state of beryllium is studied using the coupled-cluster approach, and found to Lie about 0.0048 a.u. above the ionization limit, with a width of about 0.000 34 a.u., which is the best agreement to date between theoretical and experimental data for this state. The use of complex rotation in order to describe the autoionizing property of the state, and an appropriate potential to describe excited orbitals, thereby alleviating ''intruder state'' problems, were found to be crucial components for the success of the calculation.