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. 2023 Feb 15;14(11):2915–2927. doi: 10.1039/d2sc06019a

Active space comparisona.

Quantity CASCI(6e,6o) CASCI(8e,7o)
S1–S0 0.484 0.474
S2–S0 0.484 0.474
T1–S0 0.405 0.403
T2–S0 0.405 0.403
BE 0.164 0.157
a

Binding energies (BE) and vertical singlet–singlet, singlet–triplet gaps from CASCI(6e,6o) and CASCI(8e,7o). Gaps are computed at the equilibrium geometry R = 1.357 Å and listed in Hartree units.