DOUBLY EXCITED (1)P(0) RESONANCES IN HE

Doubly excited 1P0 autoionizating states in He below the n = 2 threshold 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 products of Slater-orbitals are used for intershell states (the two electrons occupy different shells). A total of 15 resonances below the n = 2 He+ thresholds are reported in this work. This includes six members in the 2snp+ (2 less-than-or-equal-to n less-than-or-equal-to 7) 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. Comparisons are made with other theoretical calculations and with experimental observations.