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R-matrix calculation of the photoabsorption of K II, Ca III and Sc IV

The R-matrix approach is employed to study the photoionization of the argon-like ions K II, Ca III and Sc IV. The 3s3p6np 1Po Rydberg series is identified for each ion. Excellent agreement with previously published resonance positions is observed but the q-reversal reported for Ca III by van Kampen et al is not replicated in this calculation. Good agreement with experimental data is observed for K II but not for Ca III. The differences in shape of the total cross sections along the sequence are attributed to the relative positions of the 3s and 3p Cooper minima.