AUTOIONIZING (1)P(0) STATES OF HE BETWEEN THE N = 2 AND 3 THRESHOLDS OF HE+

Doubly excited 1P0 autoionizing states in He between the N = 2 and 3 thresholds of He+ ions are calculated by use of a method of complex-coordinate rotation. Hylleraas-type wave functions are used to calculate resonance parameters for the lowest ten resonances, and products of Slater orbitals are used for higher-lying resonances. In the KTNn notation, the states reported in the present work include six members in (113n) series with (3 less-than-or-equal-to n less-than-or-equal-to 8), four members in the (-113n) series (3 less-than-or-equal-to n less-than-or-equal-to 6), four members in the (203n) series (4 less-than-or-equal-to n less-than-or-equal-to 7), four members in the (003n) series (4 less-than-or-equal-to n less-than-or-equal-to 7), and three members in the (-203n) series with (4 less-than-or-equal-to n less-than-or-equal-to 6). Comparisons are made with other theoretical calculations and with experimental observations.