Journal article
Refined theoretical estimates of the atomization energies and molecular structures of selected small oxygen fluorides
The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, Vol.114(1), pp.613-623
01/14/2010
Handle:
https://hdl.handle.net/2376/117116
PMID: 19968310
Abstract
The heats of formation at 298.15 K and structures of five small oxygen fluoride molecules have been determined with coupled cluster theory incorporating at least through quadruple excitations. Because the wave functions of several of these systems exhibit strong multiconfiguration character, correlation recovery beyond CCSD(T) was found to be essential for achieving accurate results. Comparison is made with multireference configuration interaction properties where appropriate. The final DeltaH(f)(298 K) values obtained in this study are FO ((2)Pi(3/2)) = 26.5 +/- 0.2, FOO ((2)A'') = 6.4 +/- 0.7, OFO ((2)B(2)) = 125.0 +/- 0.3, FOF ((1)A(1)) = 5.9 +/- 0.3, and FOOF ((1)A) = 6.4 +/- 0.7 kcal/mol. For FO, FOO, and FOF, the theoretical DeltaH(f) values with their accompanying error bars easily fall within the experimental error bars. In the case of OFO the heat of formation has not been determined experimentally. The best current DeltaH(f) for FOOF lies outside the NIST-JANAF experimental error bars (4.59 +/- 0.5 kcal/mol) despite the use of very high levels of theory and the adoption of what is believed to be a conservative estimate of the theoretical uncertainty. Good agreement with experiment was found for the structures.
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Details
- Title
- Refined theoretical estimates of the atomization energies and molecular structures of selected small oxygen fluorides
- Creators
- David Feller - Department of Chemistry, Washington State University, Pullman, Washington 99164-4630, USA. dfeller@owt.comKirk A PetersonDavid A Dixon
- Publication Details
- The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, Vol.114(1), pp.613-623
- Academic Unit
- Chemistry, Department of
- Publisher
- United States
- Identifiers
- 99900548358701842
- Language
- English
- Resource Type
- Journal article