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CO(v) Produced From CH3 or CD3 + O

Published

Author(s)

T P. Marcy, R R. Diaz, Dwayne E. Heard, S R. Leone, L B. Harding, S J. Klippenstein

Abstract

Combined experimental and theoretical investigations of the title reactions are presented. Time-resolved Fourier transform infrared (FTIR) emission studies of CO(v=1) produced from the CH3 + O and CD3 + O reactions show that there is approximately a one third reducation in the branching to the CO channel upon deuteration of the methyl radical. Direct dynamics, classical trajectory calculations using a B3LYP potential surface confirm the existence of the CO producing channel. The calculations show that the CO comes from the decomposition of HCO produced by the elimination of H2 from highly vibrationally excited methoxy radicals. Scans of the potential surface reveal no transition state for the direct elimination of H2 from methoxy. The minimum energy path for this elimination is a stepwise process involving first a CH bond cleavage, forming H + H2CO, followed by an abstraction, forming H + H2CO. However, at the high internal energies produced in the initial O + CH3 addition, trajectories for the direct elimination of H2 from methoxy are observed. The predicted branching ration between the CO and H2CO channels is in good agreement with previous measurements. The observed reduction in the branching to the CO channel upon deuteration is also well reproduced in the calculations.
Citation
Journal of Physical Chemistry

Keywords

methyl radical, oxygen atom

Citation

Marcy, T. , Diaz, R. , Heard, D. , Leone, S. , Harding, L. and Klippenstein, S. (2021), CO(v) Produced From CH<sub>3</sub> or CD<sub>3</sub> + O, Journal of Physical Chemistry (Accessed April 22, 2024)
Created October 12, 2021