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The R-matrix method is used to calculate the total and partial cross sections for the photoionisation of the ground 3s 2 3p 2 P o state of aluminium for photon energies from the 3s 2 1 S Al + threshold to 1.55 Ryd. The 12 lowest LS states 3s 2 1 S, 3s3p 1,3 P o , 3p 2 3 P, 1 D, 1 S, 3s4s 1,3 S, 3s3d 1,3 D, 3s4p 1,3 P o of the Al + ion are included in the calculation. Extensive configuration interaction wavefunctions are used to describe both the initial Al state and the final Al + states. The cross sections are dominated by Rydberg series of resonances converging to the ionic excited-state thresholds. The present results are compared, where possible, with the experimental measurements of Kohl and Parkinson (1973) and Roig (1975) and the earlier R-matrix calculation of Le Dourneuf et al (1975); good agreement is obtained.
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Tayal et al. (1987) studied this question.
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