Abstract
In the framework of a non-relativistic single-electron model, photoionisation cross sections from nl states (n<or=20, 0<or=l<or=4) have been computed for the Rb, Cu and Ag sequences. The evolution of non-hydrogenic behaviour of photoionisation near threshold is studied along the sequences, and emphasis is put on the occurrence of minima in the photoionisation cross section curves. Systematic trends along a sequence and the comparison of the behaviour along the different K, Rb, Cu and Ag sequences are analysed in terms of the quantum-defect theory. Through the principle of detailed balance, scaled radiative recombination coefficients alpha 'nl(T)' for Sr+-Y2+, Cu-Ga2+ and Ag-Sn3+ have been obtained within the scaled electron temperature range 500<or=T'<or=5000 K, and compared with the corresponding hydrogen results. Markedly non-hydrogenic features and systematics of recombination along isoelectronic sequences have been outlined.
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