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• W2414705554 endingPage "16670" @default.
• W2414705554 startingPage "16659" @default.
• W2414705554 abstract "Understanding the falloff in rate constants of gas-phase unimolecular reaction rate constants as the pressure is lowered is a fundamental problem in chemical kinetics, with practical importance for combustion, atmospheric chemistry, and essentially all gas-phase reaction mechanisms. In the present work, we use our recently developed system-specific quantum RRK theory, calibrated by canonical variational transition state theory with small-curvature tunneling, combined with the Lindemann-Hinshelwood mechanism, to model the dissociation reaction of fluoroform (CHF3), which provides a definitive test for falloff modeling. Our predicted pressure-dependent thermal rate constants are in excellent agreement with experimental values over a wide range of pressures and temperatures. The present validation of our methodology, which is able to include variational transition state effects, multidimensional tunneling based on the directly calculated potential energy surface along the tunneling path, and torsional and other vibrational anharmonicity, together with state-of-the-art reaction-path-based direct dynamics calculations, is important because the method is less empirical than models routinely used for generating full mechanisms, while also being simpler in key respects than full master equation treatments and the full reduced falloff curve and modified strong collision methods of Troe." @default.
• W2414705554 created "2016-06-24" @default.
• W2414705554 creator A5010723453 @default.
• W2414705554 creator A5061717048 @default.
• W2414705554 creator A5073787453 @default.
• W2414705554 date "2016-01-01" @default.
• W2414705554 modified "2023-10-18" @default.
• W2414705554 title "Predicting pressure-dependent unimolecular rate constants using variational transition state theory with multidimensional tunneling combined with system-specific quantum RRK theory: a definitive test for fluoroform dissociation" @default.
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• W2414705554 doi "https://doi.org/10.1039/c6cp02765b" @default.
• W2414705554 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27273734" @default.

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