Photoelectron spectra of transition-metal hexafluoroacetylacetonates and the supposed breakdown of Koopmans' theorem in these compounds

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Abstract
The initial parts of the photoelectron spectra of the trishexafluoroacetylacetone complexes of chromium, iron, and cobalt are presented; from the spectra there is no evidence for any inversion of orbital sequence upon ionization, but the chromium and iron complexes show an effect which may be ascribed to their open-shell nature.