The multiconfigurational self-consistent field model

In MCSCF theory, the wave function is written as a linear combination of determinants or CSFs. whose expansion coefficients are optimized simultaneously with the MOs according to the variation 

This model allows for a highly flexible description of the electronic system, where both the one-electron functions (the MOs) and the A -electron function (the configurations) may adapt to the physical situation. 

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MCSCF, the multiconfigurational self-consistent field model... 

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