Photoionisation of the 3s23p2Poground state of aluminium

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Abstract
The R-matrix method is used to calculate the total and partial cross sections for the photoionisation of the ground 3s23p 2Po state of aluminium for photon energies from the 3s2 1S Al+ threshold to 1.55 Ryd. The 12 lowest LS states 3s2 1S, 3s3p 1,3Po, 3p2 3P, 1D, 1S, 3s4s 1,3S, 3s3d 1,3D, 3s4p 1,3Po 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.