DOUBLY-EXCITED (3)P(O) RESONANCE STATES OF HE BELOW THE N=2 AND N=3 HE+ THRESHOLDS

Doubly excited P-3(o) autoionizing states in He below the N = 2 and N = 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 intrashell states (the two electrons occupy the same shell) and other low-lying states, and products of Slater orbitals are used for high-lying intershell states (the two electrons occupy different shells). A total of 16 resonances below the N = 2 He+ thresholds are reported in this work. This includes seven members in the 2snp+ (2 less-than-or-equal-to n less-than-or-equal-to 8) series, five members in the 2snp - (3 less-than-or-equal-to n less-than-or-equal-to 7) series, and four members in the 2pnd (3 less-than-or-equal-to n less-than-or-equal-to 6) series. A total of 19 resonances below the N = 3 He+ threshold are also reported here. Using the (KTNn) notation, the present work includes five members in the (203n) series with (3 less-than-or-equal-to n less-than-or-equal-to 7), five members in the (003n) series (3 less-than-or-equal-to n less-than-or-equal-to 7), four members in the (I 13n) series (4 less-than-or-equal-to n less-than-or-equal-to 7), three members in the (- 113n) series (4 less-than-or-equal-to n less-than-or-equal-to 6), and two members in the (- 203n) series (4 less-than-or-equal-to n less-than-or-equal-to 5). Comparisons are made with other theoretical calculations.