Benchmark Thermochemistry of the Hydroperoxyl Radical

Bradley A. Flowers, Péter G. Szalay, John F. Stanton, Mihály Kállay, Jürgen Gauss, Attila G. Császár

Research output: Contribution to journalArticle

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Abstract

A theoretical estimation of the enthalpy of formation for the hydroperoxyl radical is presented. These results are based on CCSD(T)/aug-cc-pCV5Z calculations extrapolated to the basis-set limit with additional corrections. Anharmonic vibrational zero-point energies, scalar relativistic, spin - orbit coupling, and diagonal Born - Oppenheimer corrections are further used to correct the extrapolated term energies, as well as various empirical corrections that account for correlation effects not treated at the CCSD(T) level. We estimate that Δ fH 0 o = 3.66 ± 0.10 kcal mol -1fH 298 o = 2.96 ± 0.10 kcal mol -1) using several reaction schemes. Significantly, it appears to be necessary to include effects of connected pentuple excitations in order to achieve an uncertainty of ca. 0.1 kcal mol -1.

Original languageEnglish
Pages (from-to)3195-3199
Number of pages5
JournalJournal of Physical Chemistry A
Volume108
Issue number15
DOIs
Publication statusPublished - Apr 15 2004

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Thermochemistry
thermochemistry
Enthalpy
Orbits
zero point energy
enthalpy
scalars
orbits
estimates
excitation
Uncertainty
energy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Benchmark Thermochemistry of the Hydroperoxyl Radical. / Flowers, Bradley A.; Szalay, Péter G.; Stanton, John F.; Kállay, Mihály; Gauss, Jürgen; Császár, Attila G.

In: Journal of Physical Chemistry A, Vol. 108, No. 15, 15.04.2004, p. 3195-3199.

Research output: Contribution to journalArticle

Flowers, Bradley A. ; Szalay, Péter G. ; Stanton, John F. ; Kállay, Mihály ; Gauss, Jürgen ; Császár, Attila G. / Benchmark Thermochemistry of the Hydroperoxyl Radical. In: Journal of Physical Chemistry A. 2004 ; Vol. 108, No. 15. pp. 3195-3199.
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AU - Stanton, John F.

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AU - Gauss, Jürgen

AU - Császár, Attila G.

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