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Falloff Curves and Mechanism of the Thermal Decomposition of CF3I in Shock Waves

Abstract

The falloff curves of the unimolecular dissociation CF3I (+Ar) → CF3 + I (+Ar) are modelled by combining quantum-chemical characterizations of the potential energy surface for the reaction, standard unimolecular rate theory, and experimental information on the average energy transferred per collision between excited CF3I and Ar. The (essentially) parameter-free theoretical modelling gives results in satisfactory agreement with data deduced from earlier shock wave experiments employing a variety of reactant concentrations (between a few ppm and a few percent in the bath gas Ar). New experiments recording absorption-time signals of CF3I, I2, CF2 and (possibly) FI at 450 – 500 and 200 – 300 nm are reported. By analysing the decomposition mechanism, besides the unimolecular dissociation of CF3I, these provide insight into the influence of secondary reactions on the experimental observations.

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Publication details

The article was received on 28 Aug 2019, accepted on 07 Oct 2019 and first published on 09 Oct 2019


Article type: Paper
DOI: 10.1039/C9CP04771A
Phys. Chem. Chem. Phys., 2019, Accepted Manuscript
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    Falloff Curves and Mechanism of the Thermal Decomposition of CF3I in Shock Waves

    J. Troe, E. Tellbach, L. Soelter and C. J. Cobos, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP04771A

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