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An extension of the R-matrix theory of atomic photoionisation of Burke and Taylor (1975) to allow calculations within a pair-coupling scheme is reported. An application to the calculation of the photoionisation cross section and asymmetry parameter in the region of the Beutler-Fano resonances in argon is presented. The origins of phenomena not previously ascribable to any particular relativistic term in the Hamiltonian are accounted for.
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Taylor et al. (1981) studied this question.
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