Doubly excited S-1,3(e), P-1,3(o), and D-1,3(e) resonances in He below the n=2 He+ threshold

We study doubly excited S-1,3(e), P-1,3(o), and D-1,3(e) resonances in He below the n = 2 He+ threshold by the saddle-point complex-rotation method with B-spline functions. We calculated 78 resonances. Recently, accurate measurements on the P-1(o) have been performed, which allow detailed comparisons with our ab initio theoretical results. For P-1(o), we calculate six members in the (2)(0,1)(n)(+)(2 less than or equal to n less than or equal to 7) series, five members in the (2)(1,0)(n)(-)(3 less than or equal to n less than or equal to 7) series, and four members in the (2)(-1,0)(n)(0)(3 less than or equal to n less than or equal to 6) series. The resonance energies and widths are compared with accurate experimental and theoretical results. The agreement is good. For other symmetries, the energies and widths are also calculated up to n congruent to 7, and are also in good agreement with available experimental and theoretical results. [S1050-2947(97)01912-4].