title: Photoelectron spectroscopy of europium-silicon cluster anions, EuSin- (3<or=n<or=17).
abstract: We report the photoelectron spectra of EuSi(n) (-) cluster anions (3<or=n<or=17). They reveal dramatic electronic rearrangements over the size range n=10-12. In particular, a marked increase in the adiabatic electron affinity of EuSi(12) (2.8 eV) compared to its stoichiometric neighbor, EuSi(11) (1.9 eV), is observed. We propose that a significant geometric reorganization due to the encapsulation of a europium atom occurs in this size range and is responsible for the detected changes in the electronic structure. In light of this interpretation, EuSi(12) is the smallest fully endohedral europium-silicon cluster.
authors.affiliation: Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, USA.
authors.forename: Andrej
authors.initials: A
authors.lastname: Grubisic
authors.forename: Haopeng
authors.initials: H
authors.lastname: Wang
authors.forename: Yeon Jae
authors.initials: YJ
authors.lastname: Ko
authors.forename: Kit H
authors.initials: KH
authors.lastname: Bowen