Photoionization of the 2¹S and 2³S states of helium

The continuous oscillator strengths for photoionization of the 21S and 23S states of helium are evaluated in the dipole length and velocity formulations for transitions which leave the He+ ion in a 1s, 2s or 2p state. The calculations are performed with two sets of wavefunctions: Calculation A uses frozen core Hartree-Fock bound and free state functions; Calculation B uses a 56-parameter bound state representation with frozen core Hartree-Fock free state functions. Where possible the results are compared with the more accurate values of Jacobs and Burke.