Incremental Full Configuration Interaction (iFCI) reaches high accuracy electronic energies via a many-body expansion of the correlation energy. In this work, the Perfect Pairing (PP) ansatz replaces the Hartree-Fock reference of the original iFCI method. This substitution captures a large amount of correlation at zero-order, which allows iFCI to recover the remaining correlation energy with low-order increments. The resulting approach, PP-iFCI, is size consistent, size extensive, and systematically improvable with increasing order of incremental expansion. Tests on multiple single bond, multiple double bond, and triple bond dissociations of main group polyatomics using double and triple zeta basis sets demonstrate the power of the method for handling strong correlation. The smooth dissociation profiles that result from PP-iFCI show that FCI-quality ground state computations are now within reach for systems with up to about 10 heavy atoms.
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14 June 2017
Research Article|
June 12 2017
Strong correlation in incremental full configuration interaction
Paul M. Zimmerman
Paul M. Zimmerman
a)
Department of Chemistry, University of Michigan
, 930 N. University Ave., Ann Arbor, Michigan 48109, USA
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Paul M. Zimmerman
a)
Department of Chemistry, University of Michigan
, 930 N. University Ave., Ann Arbor, Michigan 48109, USA
J. Chem. Phys. 146, 224104 (2017)
Article history
Received:
March 09 2017
Accepted:
May 30 2017
Citation
Paul M. Zimmerman; Strong correlation in incremental full configuration interaction. J. Chem. Phys. 14 June 2017; 146 (22): 224104. https://doi.org/10.1063/1.4985566
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