Geometry-dependent atomic multipole models for the water molecule

The Journal of Chemical Physics
Oleksandr Loboda, Claude Millot

Abstract

Models of atomic electric multipoles for the water molecule have been optimized in order to reproduce the electric potential around the molecule computed by ab initio calculations at the coupled cluster level of theory with up to noniterative triple excitations in an augmented triple-zeta quality basis set. Different models of increasing complexity, from atomic charges up to models containing atomic charges, dipoles, and quadrupoles, have been obtained. The geometry dependence of these atomic multipole models has been investigated by changing bond lengths and HOH angle to generate 125 molecular structures (reduced to 75 symmetry-unique ones). For several models, the atomic multipole components have been fitted as a function of the geometry by a Taylor series of fourth order in monomer coordinate displacements.

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Citations

Nov 4, 2017·The Journal of Chemical Physics·Jean-Philip Piquemal, Kenneth D Jordan
Jan 14, 2022·Physical Chemistry Chemical Physics : PCCP·Frank Jensen

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