Relative partial photoionization cross sections and photoelectron branching ratios of the valence bands (6-22-eV binding energy) of bis(annulene)uranium(IV) are reported over the photon energy range 24–125 eV. The f-1 band shows cross-section features attributable to 5f resonant photoemission in the vicinity of the 5d →5f giant resonant absorption (hv = 101 and 110 eV). The e2g1 and e2u1 bands also show small cross-section maxima at these energies, that for the e2u1 ionization being the more intense. The f-1 band shows a large maximum at 39 eV, which is assigned to a delayed maximum due to the centrifugal barrier. The three highest ionization energy bands (from ligand-based orbitals) show essentially monotonic cross section decrease with photon energy. The mapping of the intensity changes of the f-1 band by the e2u-1band provides strong evidence for f orbital covalency in this molecule.
|Original language||English (US)|
|Number of pages||5|
|Journal||Journal of the American Chemical Society|
|State||Published - Mar 1989|
All Science Journal Classification (ASJC) codes
- Colloid and Surface Chemistry