Electrons hybridization and

M. Campagna and F.U. Hillebrecht, f-electron hybridization and dynamical screening of core holes in intermetallic compounds 75... 

Campagna, M., and F.U. Hillebrecht, 1987, f-Electron hybridization and dynamical screening of core holes in intermetallic compounds, in Handbook on the Physics and Chemistry of Rare Earths, Vol. 10, eds K.A. Gschneidner Jr, L. Eyring and S. Hufner (North-Holland, Amsterdam) ch. 63, p. 75. 

In the cluster, if the lattice parameter were larger than that of y-Ce and/or if most of the atoms were atoms with fewer than full coordination, we would expect to observe y-Ce-like emission but with less 4f-conduction electron hybridization and weaker 4f-5d Coulomb interaction. Significantly, in discussions of the double-peaked structure in metallic Ce (next section), when diminishing 4f conduction electron hybridization or 4f-5d Coulomb interaction have been considered, the structure nearer the Fermi level is the one that weakens. The observed behavior for Ce clusters then encourages further consideration of these parameters. 

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