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An approach to atomic structure calculations is described, using recent developments in the pseudo-state/ R -matrix method, within the high optimization offered by close-coupling. These include the exploitation of the "QB" method for systematic resonance analysis, the definition and use of "core base states" for the target, and the incorporation of relativistic effects in the Opacity Project codes. A comprehensive set of data is calculated for fine-structure bound and continuum states of the form 1s 2 2s nl and 1s 2 2p nl ( J = 0 e and J = 1 o ) up to n = 10 for the Be-like ion C III, together with electric dipole oscillator strengths.
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Berrington et al. (1998) studied this question.
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