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Automatic generation of complementary auxiliary basis sets for explicitly correlated methods. | LitMetric

Automatic generation of complementary auxiliary basis sets for explicitly correlated methods.

J Comput Chem

Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Reḥovot, Israel.

Published: September 2022

AI Article Synopsis

Article Abstract

Explicitly correlated calculations, aside from the orbital basis set, typically require three auxiliary basis sets: Coulomb-exchange fitting (JK), resolution of the identity MP2 (RI-MP2), and complementary auxiliary basis set (CABS). If unavailable for the orbital basis set and chemical elements of interest, the first two can be auto-generated on the fly using existing algorithms, but not the third. In this paper, we present a quite simple algorithm named autoCABS; a Python implementation under a free software license is offered at Github. For the cc-pVnZ-F12 (n = D,T,Q,5), the W4-08 thermochemical benchmark, and the HFREQ2014 set of harmonic frequencies, we demonstrate that autoCABS-generated CABS basis sets are comparable in quality to purpose-optimized OptRI basis sets from the literature, and that the quality difference becomes entirely negligible as n increases.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9544771PMC
http://dx.doi.org/10.1002/jcc.26970DOI Listing

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