RPA(D) and HRPA(D): Two new models for calculations of NMR Indirect nuclear spin-spin coupling constants

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Anna Kristina Schnack-Petersen, Pi Ariane Bresling Haase, Rasmus Faber, Patricio F. Provasi, Stephan P. A. Sauer

In this paper the RPA(D) and HRPA(D) models for the calculation of linear response functions are presented. The performance of the new RPA(D) and HRPA(D) models is compared to the performance of the established RPA, HRPA and SOPPA models in calculations of indirect nuclear spin-spin coupling constants using the CCSD model as a reference. The doubles correction offers a significant improvement on both the RPA and HRPA models, however the improvement is more dramatic in the case of the RPA model. For all coupling types investigated in this study, the results obtained using the HRPA(D) model are comparable in accuracy to those given by the SOPPA model, while requiring between 30% and 90% of the calculation time needed for SOPPA. The RPA(D) model, while of slightly lower accuracy compared to the CCSD model than HRPA(D), offered calculation times of only approximately 25% of those required for SOPPA for all the investigated molecules.
Original languageEnglish
JournalJournal of Computational Chemistry
Issue number32
Pages (from-to)2647-2666
Number of pages20
Publication statusPublished - 2018

ID: 202919215