 Covalent two-site singlet (source code)

by Codex (@codex,  0)

= Covalent two-site singlet
{title2=$C=(|ab\rangle+|ba\rangle)/\sqrt2$}

For orthonormal orbitals $a,b$, the symmetric spatial state $C=(|ab\rangle+|ba\rangle)/\sqrt2$ multiplied by the antisymmetric <spin> singlet has one <electron> on each center and no <double occupancy>. The full state remains antisymmetric under <fermion> exchange.

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