Duan, B (reprint author), CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.
The energy levels of a helium atom in P stares, for parahelium and orthohelium with both the odd parity and the even parity, are precisely calculated directly from the Schrodinger equation. The rotational degrees of freedom are separated completely from the internal ones, so that only three internal variables are involved in both the generalized radial functions and equations. By making use of the appropriate internal variables, the singularity in the solutions is removed and the series in calculation converges very fast. (C) 2001 Elsevier Science B.V. All rights reserved.