Observation of the transition from uncollapsed to collapsed excited f-wave functions in I-, Xe, and Cs+ via the giant post-collision-interaction Auger effect

The nature of the final f-wave functions, i.e., spatially collapsed versus uncollapsed, involved in 4d→4f, εf giant absorption resonances in I-, Xe, and Cs+ is revealed by studying the post-collision interaction (PCI) in the N4,5O2,3O2,3 Auger decay of the 4d hole. While small PCI Auger shifts 0.2 eV are observed for I- and Xe with uncollapsed f-wave functions, a giant PCI Auger shift of ∼ 1 eV is observed for Cs+ with collapsed f-wave functions. © 1980 The American Physical Society.