These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
A linear-scaling method for non-covalent interactions
preprintsubmitted on 22.05.2019, 09:23 and posted on 22.05.2019, 15:28 by Robert Shaw, Grant Hill
A novel method for the accurate and efficient calculation of interaction energies in weakly-bound complexes comprised of a large number of molecules is presented. The new ALMO+RPAd method circumvents the prohibitive scaling of coupled cluster singles and doubles while still providing similar accuracy across a diverse range of intermolecular interactions. Tests on various dimers and the S66 benchmark set demonstrate results within 0.5 kcal/mol of coupled cluster singles and doubles results. On a large cluster of water molecules, we achieve calculations involving over 3500 orbital and 12000 auxiliary basis functions in under ten minutes on a single CPU core.