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Shock wave and theoretical modeling study of the dissociation of CH2F2 I. Primary processes.

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Sölter,  L.
Emeritus Group of Spectroscopy and Photochemical Kinetics, MPI for Biophysical Chemistry, Max Planck Society;

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Tellbach,  E.
Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society;

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Troe,  J.
Emeritus Group of Spectroscopy and Photochemical Kinetics, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Cobos, C. J., Hintzer, K., Sölter, L., Tellbach, E., Thaler, A., & Troe, J. (2017). Shock wave and theoretical modeling study of the dissociation of CH2F2 I. Primary processes. Journal of Physical Chemistry A, 121(41), 7813-7819. doi:10.1021/acs.jpca.7b05854.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-FCC1-B
Abstract
The unimolecular dissociation of CH2F2 leading to CF2 + H2, CHF + HF, or CHF2 + H, is investigated by quantum chemical calculations and unimolecular rate theory. Modeling of the rate constants is accompanied by shock wave experiments over the range 1400 – 1800 K monitoring the formation of CF2. It is shown that the energetically most favorable dissociation channel leading to CF2 + H2 has a higher threshold energy than the energetically less favorable one leading to CHF + HF. Falloff curves of the dissociations are modeled. Under the conditions of the described experiments, the primary dissociation CH2F2 → CHF + HF is followed by a reaction CHF + HF → CF2 + H2. The experimental value of the rate constant of the latter indicates that this reaction does not proceed by an addition-elimination process as assumed before, but by a more direct abstraction pathway involving elements of roaming dynamics.