Photoelectron spectroscopy of europium-silicon cluster anions, EuSin- (3<or=n<or=17).
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.
Grubisic
Andrej
A
Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Wang
Haopeng
H
Ko
Yeon Jae
YJ
Bowen
Kit H
KH