Resonance energies and autoionization widths of the 2p2De1, 3d2Ge1 and 4f2Ie1 doubly excited states of the helium isoelectronic sequence

The energies and autoionization widths of the 2p2De1, 3d2Ge1 and 4f2Ie1 doubly excited Feshbach resonances are calculated for Z=1Z=1, 2–10. The complex eigenvalue Schrödinger equations are solved. The calculations have been carried out by using the complex rotation method, and analytic real and complex orbitals as basis set functions. Our results are compared to available experimental data and to other theoretical calculations.