Fluorescence yields for Rydberg series in ions belonging to the He isoelectronic sequence

Fluorescence yields are reported for Rydberg series members in He-like ions of N, O and Ne. Results are presented for singlet series members with n values between 3 and 9, i.e. up to the region of overlap with the states belonging to the manifold in these atoms. This data is required, for example, for the interpretation of charge-exchange experiments involving bare N, O and Ne nuclei. Fluorescence yields, averaged over all singlet states, larger than 50% are obtained from about n = 7.