Doubly excited resonant states in H- below the n=2 hydrogen threshold

We calculated the (2sns) S-1(e) (n = 2, 3, 4), (2sns)S-3(e) (n = 3, 4, 5), (2snp) (1)p(o) (n = 3, 4), (2snp)P-3(o) (n = 2, 3, 4) and 2p(2) D-1(e) autoionizing states in H- below the n = 2 hydrogen threshold by the saddle-point complex-rotation method. The close-channel part of wavefunctions are constructed by B-spline basis functions. The resonance energies and autoionization widths are determined. They are compared with other theoretical and experimental results to examine the feasibility of applying B-spline basis functions through the saddle-point complex-rotation method in resonance states.