Abstract
Doubly excited1P0 autoionizating states in He below then=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 then=2 He+ thresholds are reported in this work. This includes six members in the 2snp+ (2≦n≦7) series, five members in the 2snp− (3≦n≦7) series, and four members in the 2pnd (3≦n≦6) series. Comparisons are made with other theoretical calculations and with experimental observations.
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