Charge Transfer Interaction between Ab Initio and Effective Fragment Potential Molecules
Megan R Schlinsog1, Mark S Gordon1
1Department of Chemistry and Ames National Laboratory, Iowa State University, Ames, Iowa50011, United States.
Abstract:
The charge transfer contribution to the intermolecular interaction between ab initio (QM) and effective fragment potential (EFP) molecules is derived and implemented. In this QM-EFP method, the charge transfer term is derived by applying second-order perturbation theory; the resulting expression is implemented in GAMESS. The effect of the charge transfer contribution on the accuracy of the total QM-EFP intermolecular interaction energy is evaluated by comparing to the benchmark interaction energies for the S22 and S66 data sets. Charge transfer significantly improves the accuracy of QM-EFP when compared to benchmark values.
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