Barone V, Lupi J, Salta Z, Tasinato N. Development and Validation of a Parameter-Free Model Chemistry for the Computation of Reliable Reaction Rates.
J Chem Theory Comput 2021;
17:4913-4928. [PMID:
34228935 PMCID:
PMC8359010 DOI:
10.1021/acs.jctc.1c00406]
[Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
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A recently developed
model chemistry (jun-Cheap) has been slightly
modified and proposed as an effective, reliable, and parameter-free
scheme for the computation of accurate reaction rates with special
reference to astrochemical and atmospheric processes. Benchmarks with
different sets of state-of-the-art energy barriers spanning a wide
range of values show that, in the absence of strong multireference
contributions, the proposed model outperforms the most well-known
model chemistries, reaching a subchemical accuracy without any empirical
parameter and with affordable computer times. Some test cases show
that geometries, energy barriers, zero point energies, and thermal
contributions computed at this level can be used in the framework
of the master equation approach based on the ab initio transition-state
theory for obtaining accurate reaction rates.
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