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| - How Active Is the Bend Excitation of Methane in the Reaction with O(3P)?
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| - The role of bending excitation of methane in the reaction with O(3P) is investigated in a crossed-beamexperiment. Previous theories predicted that either stretch or bend excitation of the reactant promotes chemicalreactivity and that initial bending excitation of CH4 preferentially yields umbrella-excited CH3 products.Experimentally, both predictions for bend-excited reagent were not borne out in this investigation. We foundinstead that compared to the ground-state reagent, bend-excited methane yields more vibrational excitationof the hydroxyl coproduct. The first reported product angular distributions show predominant backwardscatterings for both ground-state and bend-excited methanes, which corroborate well with a direct reboundreaction mechanism.
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