An Automated Thermochemistry Protocol based on Explicitly Correlated Coupled-Cluster Theory: The Methyl and Ethyl Peroxy Families

Abstract

An automated computational thermochemistry protocol based on explicitly correlated coupled-cluster theory was designed to produce highly accurate enthalpies of formation and atomization energies for small- to medium-sized molecular species (3-12 atoms). Each potential source of error was carefully examined, and the sizes of contributions to the total atomization enthalpies were used to generate uncertainty estimates. The protocol was first used to generate total atomization enthalpies for a family of four molecular species exhibiting a variety of charges, multiplicities, and electronic ground states. The new protocol was shown to be in good agreement with the Active Thermochemical Tables database for the four species: the methyl peroxy radical, methoxyoxoniumylidene (methyl peroxy cation), methyl peroxy anion, and methyl hydroperoxide. Updating the Active Thermochemical Tables to include those results yielded significantly improved accuracy for the formation enthalpies of those species. The derived protocol was then used to predict formation enthalpies for the larger ethyl peroxy family of species.

Department(s)

Chemistry

Research Center/Lab(s)

Center for High Performance Computing Research

International Standard Serial Number (ISSN)

1089-5639; 1520-5215

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 NLM (Medline), All rights reserved.

Publication Date

01 Jul 2019

PubMed ID

31244124

Link to Full Text

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