Crossed molecular beam study of the reaction O( sup 3 P )+C sub 2 H sub 2

The reaction between ground state atomic oxygen and acetylene was studied using the crossed molecular beam method with an average collision energy of 6 kcal/mol. The two major primary reaction channels are (a) formation of CH{sub 2} and CO and (b) formation of HCCO and H. Product angular distributio...

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Bibliographic Details
Published in:The Journal of chemical physics 1989-11, Vol.91:9
Main Authors: Schmoltner, A.M., Chu, P.M., Lee, Y.T.
Format: Article
Language:English
Subjects:
400102 - Chemical & Spectral Procedures
400800 - Combustion, Pyrolysis, & High-Temperature Chemistry
640304 - Atomic, Molecular & Chemical Physics- Collision Phenomena
ACETYLENE
ALKYNES
ANGULAR DISTRIBUTION
ATOMIC AND MOLECULAR PHYSICS
BEAMS
BRANCHING RATIO
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION YIELD
COLLISIONS
COMBUSTION PRODUCTS
DISTRIBUTION
ELEMENTS
FLAMES
HYDROCARBONS
HYDROGEN
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
KETENES
METHYLENE RADICALS
MOLECULAR BEAMS
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
RADICALS
REACTION INTERMEDIATES
TIME-OF-FLIGHT METHOD
YIELDS
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Description
Summary:The reaction between ground state atomic oxygen and acetylene was studied using the crossed molecular beam method with an average collision energy of 6 kcal/mol. The two major primary reaction channels are (a) formation of CH{sub 2} and CO and (b) formation of HCCO and H. Product angular distributions and time-of-flight spectra were measured and the translational energy release was determined for each channel. The reaction proceeds primarily on the triplet surface through a long-lived intermediate. For both channels the translational energy distributions were found to peak at about 30% of the total available energy, indicating the existence of an exit channel barrier in each case. The branching ratio between channel (a) and (b) was found to be 1.4{plus minus}0.5.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.457585