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R-matrix calculation of dielectronic recombination rate coefficients. Application to Li-like Al

The R-matrix method is used to obtain accurate values of energies and autoionisation widths for intermediate resonance states formed during dielectronic recombination processes. Rate coefficients are calculated for the Al10+ ground state, both in the L-S and intermediate coupling schemes. The effect of the fine structure splitting of the core level is studied using quantum defect theory. The relative importance of dielectronic and direct radiative recombination processes in Al10+ plasmas is discussed.