Abstract
Values of the level intervals in the ground configurations 2s2 2p2, 2s2 2p3 and 2s2 2p4 have been critically compiled from laboratory observations and from observations of nebular and coronal forbidden transitions. The data are represented within experimental errors by means of semi-empirical extrapolation formulae which contain from 3 to 5 adjusted parameters. The results provide means for checking laboratory and astrophysical identifications and measurements. Tables of ‘best’ level values are given for the configurations concerned.
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