Semi-Cluster Expansion Theories for the Open-Shell States

SEMI-CLUSTER EXPANSION THEORIES FOR THE OPEN-SHELL STATES 

When the number of valence electrons are far less in comparison to the number of core electrons, the bulk of the size—extensivity of the total energy 

5) indicates that 4 k receives contribution from the correlating virtual determinants in 

IT+n the core-reorganization and core-correlation changes attendant with the addition of valence holes and/or particles are not very severe, then a 

As the name indicates, these methods determine the coefficients C by an appeal to the variational principle for the state energies E We shall discuss two principal formalisms which make use of this strategy. 

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