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- W2007137685 abstract "To analyze the effect of the C−H stretch mode excitation on the dynamics of the Cl + CHD3 gas-phase abstraction reaction, an exhaustive state-to-state dynamics study was performed. This reaction can evolve along two channels: H-abstraction, CD3 + ClH, and D-abstraction, CHD2 + ClD. On an analytical potential energy surface constructed previously by our group, named PES-2005, quasi-classical trajectory calculations were performed at a collision energy of 0.18 eV, including corrections to avoid zero-point energy leakage along the trajectories. First, strong coupling between different vibrational modes in the entry valley was observed; i.e., the reaction is vibrationally nonadiabatic. Second, for the ground-state CHD3(ν=0) reaction, the diatomic fragments appeared in their ground states, and the H- and D-abstraction reactions showed similar reactivities. However, when the reactivity per atom is considered, the H is three times more reactive than the D atom. Third, when the C−H stretch mode is excited by one quantum, CHD3(ν1=1), the H-abstraction is strongly favored, and the C−H stretch excitation is maintained in the product CHD2(ν1=1) + ClD channel; i.e., the reaction shows mode selectivity, reproducing the experimental evidence, and also the reactivity of the vibrational ground state is increased, in agreement with experiment. Fourth, the state-to-state angular distributions of the CD3 and CHD2 products showed the products to be practically sideways for the reactant ground state, while the C−H excitation yielded a more forward scattering, reproducing the experimental data. The role of the zero-point energy correction was also analyzed, and we find that the dynamics results are very sensitive on how the ZPE issue is treated. Finally, a comparison is made with the similar H + CHD3(ν1=0,1) and Cl + CH4(ν1=0,1) reactions." @default.
- W2007137685 created "2016-06-24" @default.
- W2007137685 creator A5054348390 @default.
- W2007137685 date "2007-09-08" @default.
- W2007137685 modified "2023-10-18" @default.
- W2007137685 title "Role of the C−H Stretch Mode Excitation in the Dynamics of the Cl + CHD<sub>3</sub> Reaction: A Quasi-classical Trajectory Calculation" @default.
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- W2007137685 doi "https://doi.org/10.1021/jp073549u" @default.
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