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Communication: Imaging the effects of the antisymmetric-stretching excitation in the O(3
P) + CH4
= 1) reaction
1. I. M. Campbell, Energy and the Atmosphere (Wiley, London, 1977).
2. D. L. Baulch, C. J. Cobs, R. A. Cox, C. E. P. Frank, Th. Just, J. A. Kerr, M. J. Pilling, J. Troe, R. W. Walker, and J. Warnatz, J. Phys. Chem. Ref. Data 21, 411 (1992), and references therein.
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Effects of one-quantum excitation of the antisymmetric-stretching mode of CH4(v 3 = 1) on the O(3P) + CH4 reaction were studied in a crossed-beam, ion-imaging experiment. In the post-threshold region, we found that (1) the product state distributions are dominated by the CH3(00) + OH(v ′ = 1) pair, (2) the product angular distributions extend toward sideways from the backward dominance of the ground-state reaction, and (3) vibrational excitation exerts a positive effect on reactivity, but translational energy is more efficient in promoting the rate of this central-barrier reaction. All major findings agree reasonably well with recent theoretical results. Some remaining questions are pointed out.
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