PI — Resolve density matrix into sigma and pi bonds.

PI

PI analyzes the density matrix resulting from the SCF procedure to output the composition
of each atom-atom interaction in terms of sigma and pi bonds. The resulting description is
composed of the following basis functions: s-sigma, p-sigma, p-pi, d-sigma, d-pi, d-dell. The
diagonal terms give the hybridization state, so that an sp^{2}
hybridized system would be represented as s-sigma 1.0, p-sigma 2.0, p-pi 1.0.

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