Shape resonance in 4<i>d</i>inner-shell photoionization spectra of antimony clusters

Abstract

The photoionization of antimony clusters has been studied in the energy range 20--120 eV, probing the inner-valence 4d-np tranistions as well as the shape resonance 4d-\ensuremath{\varepsilon}f. When the cluster size is varied the photoionization efficiency presents a quite surprising behavior: For all clusters, except the ${\mathrm{Sb}}_{4\mathit{p}}$ group with p&gt;1, the photoionization pattern is similar to that which is known for the bulk. On the other hand, the shape resonance collapses completely for ${\mathrm{Sb}}_{4\mathit{p}}$. It is further shown that this dramatic change of the resonance intensity is itself dependent on the nucleation conditions, which could indicate the influence of the molecular architecture.