Abstract
In recent years sufficient new spectra of actinides in their numerous valence states have been measured to encourage a broader scale analysis effort than has been attempted in the past. Theoretical modelling in terms of effective operators has also undergone development. Well-established electronic structure parameters for the trivalent actinides are being used as a basis for estimating parameters in other valence states and relationships to atomic spectra are being extended. Recent contributions to our understanding of the spectra of 4+ actinides have been particularly revealing and supportive of a developing general effort to progress beyond a preoccupation with modelling structure to consideration of the much broader area of structure-bonding relationships. We summarize here both the developments in modelling electronic structure and the interpretation of apparent trends in bonding.
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