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| - Vibrational and Rotational Distributions of the CH(A2Δ) Product of the C2H + O(3P)Reaction Studied by Fourier Transform Visible (FTVIS) Emission Spectroscopy
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| - The C2H + O(3P) → CH(A) + CO reaction is investigated using Fourier transform visible emissionspectroscopy. The O(3P) and C2H radicals are produced by simultaneous 193 nm photolysis of SO2 and C2H2precursors, respectively. The nascent vibrational and rotational distributions of the CH(A) product are obtainedunder time-resolved, but quasi-steady-state, conditions facilitated by the short lifetime of the CH(A) emission.The vibrational temperature of the CH(A) product is found to be appreciably hotter (2800 ± 100 K) than therotational distributions in the v‘ = 0 (1400 ± 100 K) and v‘ = 1 (1250 ± 250 K) levels. The results suggestthat the reaction may proceed through an electronically excited HCCO⧧ intermediate; moreover, the vibrationalexcitation compared to rotational excitation is higher than expected based on a statistical distribution of energyand may be the result of geometrical changes in the transition state. The CH(A) emission is also observed ina C2H2/O/H reaction mixture using a microwave discharge apparatus to form O atoms, with subsequent Hatom production. The nascent rotational and vibrational distributions of the CH(A) determined by the microwavedischarge apparatus are very similar to the CH(A) distributions obtained in the photodissociation experiment.The results support the idea that the C2H + O(3P) reaction may play a role in low-pressure C2H2/O/H flames,as previously concluded.
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