Abstract
Doubly excited1 P 0 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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Ho, Y.K. Doubly excited1 P 0 resonances in He. Z Phys D - Atoms, Molecules and Clusters 21, 191–196 (1991). https://doi.org/10.1007/BF01426371
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DOI: https://doi.org/10.1007/BF01426371