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Semi-Empirical Calculations of Fine Structure Splittings and Ionisation Potentials in the MgI Isoelectronic Sequence

A semi-empirical parametrisation of the singlet-triplet and fine structure splittings for available measurements of the 3s3p 1,3P levels in the MgI isoelectronic sequence has revealed regularities which are useful for interpolation and extrapolation. By combining an extrapolation of the empirical gross energies, Slater integrals and spin-orbit splitting factors to highly ionised members of this sequence with available measurements for the 3s2 1S-3s3p 1P transitions, the positions of the members of the 3s3p 3P multiplets and the ionisation potentials can be predicted.