Autoionizing1Postates of He between theN=2 and 3 thresholds ofHe+

Doubly excited ${}_{}{}^1{}_{}{}^{}$ ${\mathit{P}}^{\mathit{o}}$ autoionizing states in He between the N=2 and 3 thresholds of ${\mathrm{He}}^{+}$ 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≤n≤8), four members in the (-113n) series (3≤n≤6), four members in the (203n) series (4≤n≤7), four members in the (003n) series (4≤n≤7), and three members in the (-203n) series with (4≤n≤6). Comparisons are made with other theoretical calculations and with experimental observations.