3¹D, 4¹D, 5¹D, 4¹F, 5¹F and 6¹F states of He

Hylleraas method variational calculations up to 367 terms are reported for the three lowest states of neutral helium with 1 D and 1 F symmetry. Convergence arguments are presented to obtain new estimates of the exact non-relativistic energies of these states. The reliability of the estimates ranges from 10 -6 au in the worst case to 10 -9 au in the best case.