Complex-coordinate calculations for doubly excited states of two-electron atoms

Doubly excited states of helium sequence (Z=1-10) are investigated by a complex-coordinate method. Some lower-lying ¹Sᵉ and 1,3Pᵒ states below the $N=2$ hydrogenic thresholds are calculated by the use of Hylleraas-type wave functions. Results are compared with recent calculations and experiments.