Abstract
The observed intensity ratio of the 3s 2 1S 0 - 3s3p 1P 1 to the 3s 2 1S 0 - 3s3p 3P 1 transitions in MgI-like ion has always presented those who model plasma spectra with a challenge; the obseved intensity of the intercombination line is always several times greater than what simple models predict. We offer a model that takes into account the contribution to the MgI-like emission features from autoionizing levels of the adjacent All-like charge state. Models in the present work give good agreement with the observed resonant/intercombination (R/I) emission ratio only when a departure from ionization equilibrium is assumed. We also identify, for the first time, intercombination lines of the form 3s3p 1P 1 · 3p 2 3P 2 in several elements relevant to both astrophysical and magnetically-confined fusion plasmas.
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