title: Spatially Homogeneous QM/MM for Systems of Interacting Molecules with on-the-Fly ab Initio Force-Field Parametrization.
abstract: Quantum and classical mechanics are combined in a hybrid many-body interaction model to enable the computationally affordable study of systems containing many interacting molecules. This model treats intramolecular and pairwise intermolecular interactions quantum mechanically, while many-body electrostatic induction effects are approximated using a polarizable force field. In this paper, we demonstrate that parametrizing the force field with distributed multipoles and atom-centered polarizabilities obtained on-the-fly from ab initio quantum mechanical monomer calculations makes the model very accurate and eliminates nearly all empiricism. Test calculations on water, formamide, hydrogen fluoride, and glycine-water clusters, all of which exhibit strong many-body interactions, are presented. The performance of the hybrid model is competitive with related point-charge embedding models.
authors.affiliation: Department of Chemistry, University of California, Riverside, California 92521.
authors.forename: Ali
authors.initials: A
authors.lastname: Sebetci
authors.affiliation: Department of Chemistry, University of California, Riverside, California 92521.
authors.forename: Gregory J O
authors.initials: GJ
authors.lastname: Beran