Abstract
Recent observations of the term structure in Ne-like and F-like ions are discussed in this article. Experimental studies of resonance lines in Ni-like and F-like ions have in recent years been extended to very high values of Z. The analyses of n = 3, Δn = 0 transitions in Ne-like ions now include Cu XX, Kr XXVII and Sr XXIX. Similar data exist for F-like ions up to Cu XXI. The n = 4 structure in Ne-like ions has now been investigated up to Mn XVI. In a few Ne-like ions also the hydrogen-like configurations have been investigated in detail.
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