A density-fitting implementation of the density-based basis-set correction method

Abstract

This work reports an efficient density-fitting implementation of the density-based basis-set correction (DBBSC) method in the MOLPRO software. This method consists in correcting the energy calculated by a wave-function method with a given basis set by an adapted basis-set correction density functional incorporating the short-range electron correlation effects missing in the basis set, resulting in an accelerated convergence to the complete-basis-set limit. Different basis-set correction density-functional approximations are explored and the complementary-auxiliary-basis-set single-excitation correction is added. The method is tested on a benchmark set of reaction energies at the second-order Møller-Plesset (MP2) level and a comparison with the explicitly correlated MP2-F12 method is provided. The results show that the DBBSC method greatly accelerates the basis convergence of MP2 reaction energies, without reaching the accuracy of the MP2-F12 method but with a lower computational cost.

6 pages, 2 figures, 1 table

References in corpus (3)

• Range-separated multideterminant density-functional theory with a short-range correlation functional of the on-top pair density
• Self-consistent density-based basis-set correction: How much do we lower total energies and improve dipole moments?
• Basis-set correction for coupled-cluster estimation of dipole moments

Cited by in corpus (1)

• Shortcut to Chemically Accurate Quantum Computing via Density-based Basis-set Correction