CAS-SCF and MRCI calculations are presented, in order to investigate the electronic states involved in the intramolecular charge-transfer process of a bistable spiro cation. The potential energy curves of the ground and the first three excited states have been calculated, and a double well potential has been obtained for the ground state. The effect of dynamical correlation was found to be crucial for a quantitative description of this system. Our results also indicate the usefulnes of a local-orbital description of bistable systems.
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