Journal
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
Volume 7, Issue 9, Pages 2842-2851Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ct200374m
Keywords
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Funding
- National Science Foundation [CHE-1011360, CHE-0957317, EPS-0903787, CHE-0946869]
- Georgia Tech.
- Office Of The Director
- EPSCoR [903787] Funding Source: National Science Foundation
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All intermolecular interactions involve London dispersion forces. The accurate treatment of dispersion is essential for the computation of realistic interaction potentials. In general, the most reliable method for computing intermolecular interactions is coupled-duster singles and doubles with perturbative triples [CCSD(T)] in conjunction with a sufficiently flexible Gaussian atomic orbital basis set, a combination which is not routinely applicable due to its excessive Computational demands (CPU time, memory, storage). Recently, many theoretical methods have been developed that attempt to account for dispersion in a more efficient manner. It is well-known that dispersion interactions are more difficult to compute in some systems than others; for example, pi-pi dispersion is notoriously difficult, while alkane alkane dispersion is relatively simple to compute. In this work, numerous theoretical methods are tested for their ability to compute reliable interaction energies in particularly challenging systems, namely, the P-2, PCCP, and NCCN dimers. Symmetry-adapted perturbation theory (SAPT) is applied to tilde dimers to demonstrate their sensitivity to the treatment of dispersion. Due to the small size of these systems, highly accurate CCSD(T) potential energy curves could be estimated at the complete basis set limit. Numerous theoretical methods are tested, against. the reliable CCSD(T) benchmarks. Methods using a treatment of dispersion that relies on time-dependent density functional theory (TDDFT) response functions are found to be the most reliable.
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