In a recent paper (1998 J. Phys. B: At. Mol. Opt. Phys. 31 3713-27), we described an intermediate-coupling frame transformation (ICFT) method based on multi-channel quantum defect theory that allows one to generate accurate level-to-level excitation data from unphysical K -matrices calculated in pure LS -coupling. In this paper, we consider ICFT R -matrix close-coupling calculations of effective collision strengths for the Mg-like ions Si 2+ , Ar 6+ , Ti 10+ and Fe 14+ . In order to further demonstrate the level of accuracy of this method, we compare our ICFT effective collision strengths with those determined from a full Breit-Pauli R -matrix calculation for Fe 14+ . We also consider the use of our radiative rates and effective collision strengths in conjunction with a collisional-radiative program to generate line-emission intensity ratios as a function of density and temperature. The full set of energies, radiative rates, and effective collision strengths for these four ions have been made available on the Internet.
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Griffin et al. (1999) studied this question.