Abstract
A model for the calculation of satellite structure in atomic spectra is presented. Based on numerical non-relativistic wavefunctions, it includes some of the effects of electron correlation via frozen-core CI calculations. The model is applied to the energies of the 2S, 2P0 and 2D states of the singly ionised rare gases Ne, Ar, Kr and Xe. The results agree with experiment to within 1 eV for most excitation energies in Ar, Kr and Xe, and for Ne when relaxation of the frozen core is accounted for. Some trends in excitation energies with atomic number are discussed, and the model's performance in the prediction of excitation energies is assessed.

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