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Highest occupied molecular orbitals. Depicted are the HOMOs of the quantum mechanically treated core region in S0 and T1 determined at the RHF/6–31G(2d,2p) and ROHF/6–31G(2d,2p) level of theory, respectively. The HOMO of S0 is a bonding π orbital, the one of T1 an anti-bonding π* orbital.