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A model subspace configuration interaction method is developed to obtainchemically accurate electron correlations by diagonalising a very compacteffective Hamiltonian of realistic molecule. The construction of the effectiveHamiltonian is deterministic and implemented by iteratively building asufficiently small model subspace comprising local clusters of a small numberof determinants. Through the low-rank reciprocal of interaction Hamiltonian,important determinants in the outer subspace are identified to couple with thesubspace of pairwise clusters. This method avoids direct ordering and selectionof the configurations in the entire space. We demonstrate the efficiency andaccuracy of this theory for several molecules of the multireference naturerelevant to chemistry.

Downfolded Configuration Interaction for Chemically Accurate Electron Correlation