Complete Active Space SCF
A particularly important MCSCF approach is the complete active space SCF method (CASSCF), where the linear combination of CSFs includes all that arise from a particular number of electrons in a particular number of orbitals (also known as full-optimized reaction space (FORS-MCSCF)). For example, one might define CASSCF(11,8) for the molecule, NO, where the 11 valence electrons are distributed between all configurations that can be constructed from 8 molecular orbitals.
Read more about this topic: Multi-configurational Self-consistent Field
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