Abstract
We all know that it is not possible to stabilize a He2 molecule. Any interaction of the filled He is orbitals would lead to the establishment of bonding a and antibonding σ* energy levels, both doubly occupied. As σ*, for quantum mechanical reasons, is raised a little bit more than σ is lowered relative to the original atomic energy levels the net result of this electronic σ/σ* configuration would be a slight repulsion of the two atoms. The situation becomes significantly different though if one of the antibonding σ* electrons is removed.
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Asmus, KD. (1990). Sulfur-Centered Three-Electron Bonded Radical Species. In: Chatgilialoglu, C., Asmus, KD. (eds) Sulfur-Centered Reactive Intermediates in Chemistry and Biology. NATO ASI Series, vol 197. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-5874-9_14
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