Modeling coarse-grained van der Waals interactions using dipole-coupled anisotropic quantum Drude oscillators

02 August 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

The Quantum Drude Oscillator (QDO) model is a promising candidate for accurately calculating the van der Waals (vdW) energies. Anisotropic QDO models have recently been used to represent molecular fragments rather than single atoms. While this model promises accurate calculation of vdW energies, there is significant room for improvements such as incorporating a proper fragmentation method, higher-order dispersion corrections, etc. The present work attempts to gauge dipole-dipole interactions’ ability without fragmentation. A suitable anisotropic damping function is also introduced to work with anisotropic QDO. This revised model accurately predicts the vdW complex for the majority of the systems considered. This work indicates the limit of dipole approximation for an anisotropic QDO-based model.

Keywords

van der Waals interaction
anisotropic quantum drude oscillator
anisotropic damping function
coarse grain

Supplementary materials

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Description
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Title
Supporting Information: Modeling coarse-grained van der Waals interactions using dipole-coupled anisotropic quantum Drude oscillators
Description
ESI contains deviation of PBE, PBE-D2, PBE-D3 and PBE-QDO for all the systems of reduced D442 dataset and interaction energy curves.
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