Autoionizing 1Po states of He between the N=2 and 3 thresholds of He+

Abstract

Doubly excited {sup 1}{ital P{ital o}} autoionizing states in He between the {ital N}=2 and 3 thresholds of He{sup +} 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 {ital KTNn} notation, the states reported in the present work include six members in (113{ital n}) series with (3{le}{ital n}{le}8), four members in the ({minus}113{ital n}) series (3{le}{ital n}{le}6), four members in the (203{ital n}) series (4{le}{ital n}{le}7), four members in the (003{ital n}) series (4{le}{ital n}{le}7), and three members in the ({minus}203{ital n}) series with (4{le}{ital n}{le}6). Comparisons are made with other theoretical calculations and with experimental observations.