Wave-function frozen-density embedding: Approximate analytical nuclear ground-state gradients

Journal of Computational Chemistry
Johannes Heuser, Sebastian Höfener

Abstract

We report the derivation of approximate analytical nuclear ground-state uncoupled frozen density embedding (FDEu) gradients for the resolution of identity (RI) variant of the second-order approximate coupled cluster singles and doubles (RICC2) as well as density functional theory (DFT), and an efficient implementation thereof in the KOALA program. In order to guarantee a computationally efficient treatment, those gradient terms are neglected which would require the exchange of orbital information. This approach allows for geometry optimizations of single molecules surrounded by numerous molecules with fixed nuclei at RICC2-in-RICC2, RICC2-in-DFT, and DFT-in-DFT FDE level of theory using a dispersion correction, required due to the DFT-based treatment of the interaction in FDE theory. Accuracy and applicability are assessed by the example of two case studies: (a) the Watson-Crick pair adenine-thymine, for which the optimized structures exhibit a maximum error of about 0.08 Å for our best scheme compared to supermolecular reference calculations, (b) carbon monoxide on a magnesium oxide surface model, for which the error amount up to 0.1 Å for our best scheme. Efficiency is demonstrated by successively including environment molecu...Continue Reading

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Citations

Aug 3, 2017·Journal of Computational Chemistry·Johannes Heuser, Sebastian Höfener
Apr 16, 2018·The Journal of Chemical Physics·Johannes Heuser, Sebastian Höfener
Mar 17, 2021·The Journal of Chemical Physics·Karin Fink, Sebastian Höfener

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