DOUBLY-EXCITED SHAPE RESONANCE STATES IN H- ABOVE THE HYDROGEN N=5 THRESHOLD

The method of complex-coordinate rotation is used to calculate shape resonances lying above the N=5 hydrogen threshold in e - H scattering. We report resonance parameters for 3Po, 1De, 3Fo, 1Fe, 1Ge, 3Ge, 1Go, 3Go, 1Ho, 3He, 1Ie, 3Io, 1Ko, and 3Ke states for a total of 19 shape resonances. Resonance energies and widths are obtained by employing up to 1642 terms of wave functions constructed by the products of Slater-type orbitals. The shape resonances are the top portions of the supermultiplet structures for doubly excited intrashell states of H- associated with the N=5 hydrogen threshold. For completeness, we also list the doubly excited Feshbach resonances obtained in previous complex-rotation calculations. Together with the present results for shape resonances, all the doubly excited intrashell states associated with the N=5 hydrogen threshold are now accounted for. © 1994 The American Physical Society.