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The continuous oscillator strengths for photoionization of the 11S state of helium are evaluated, in the dipole length and velocity formulations for transitions which leave the He+ ion and a 1s, 2s or 2p state. The calculations are performed with two sets of wave-functions; 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. Comparison with the results of Jacobs and Burke (1972) indicates the energy ranges in which more accurate free state wave functions should be used.
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Bell et al. (1973) studied this question.
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