Perturbative triples correction to domain-based local pair natural orbital variants of Mukherjee's state specific coupled cluster methodElectronic supplementary information (ESI) available. See DOI: 10.1039/c8cp03577f

• Main Authors: Lang, Jakub, Brabec, Ji í, Saitow, Masaaki, Pittner, Ji í, Neese, Frank, Demel, Ond ej
• Format: Journal Article
• Published: 27.02.2019
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/c8cp03577f

In this article we report an implementation of the perturbative triples correction to Mukherjee's state-specific multireference coupled cluster method based on the domain-based pair natural orbital approach (DLPNO-MkCC). We tested the performance of DLPNO-MkCCSD(T) in calculations involving tetramethyleneethane and isomers of naphthynes. These tests show that more than 97% of triples energy was recovered with respect to the canonical MkCCSD(T) method, which together with the DLPNO-MkCCSD part accounts for about 99.70-99.85% of the total correlation energy. The applicability of the method was demonstrated on calculations of singlet-triplet gaps for several large systems: triangulene, dynemicin A, and a beryllium complex. In this article we report an implementation of the perturbative triples correction to Mukherjee's state-specific multireference coupled cluster method based on the domain-based pair natural orbital approach (DLPNO-MkCC).