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Updated: Sep 28, 2026

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Coulomb- and antiferromagnetic-induced fission in doubly charged cubelike fe-s clusters
Xin Yang1, Xue-Bin Wang, Shuqiang Niu
1Department of Physics, Washington State University, 2710 University Drive, Richland 99352, USA.
Abstract:
We report the observation of symmetric fission in doubly charged Fe-S cluster anions, [Fe(4)S(4)X(4)](2-)-->2[Fe(2)S(2)X(2)](-) (X=Cl,Br), owing to both Coulomb repulsion and antiferromagnetic coupling. Photoelectron spectroscopy shows that both the parent and the fission fragments have similar electronic structures and confirms the inverted energy schemes due to the strong spin polarization of the Fe 3d levels. The current observation provides direct confirmation for the unusual spin couplings in the [Fe(4)S(4)X(4)](2-) clusters, which contain two valent-delocalized and ferromagnetically coupled Fe2S2 subunits.
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