The chemical dynamics of hydrogen atom abstraction from unsaturated hydrocarbons by O(3P)

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Abstract
By molecular beam‐laser induced fluorescence experiments, we have probed the nascent internal state distribution and dynamic energy thresholds of OH formed by the abstraction of hydrogen atoms from alkyl substituted olefins and alkynes. Low thresholds are obtained, especially for olefins, suggesting that this is an important mechanism in high temperature combustion. OH rotational excitation is small and implies a collinear transition state similar to that observed previously for O(3P) reaction with saturated hydrocarbons. OH vibrational excitation is also low for the olefins and suggests that considerable internal excitation of the allyl or methyl allyl radicals occur in the reactions.