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Rate constant and a detailed error analysis for C 2 H 3 + H reaction
Author(s) -
Fahr Askar
Publication year - 1995
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550270804
Subject(s) - chemistry , reaction rate constant , radical , photodissociation , hydrogen iodide , analytical chemistry (journal) , torr , hydrogen , kinetic energy , absorption (acoustics) , molecule , photochemistry , kinetics , thermodynamics , organic chemistry , optics , physics , quantum mechanics
The production and reactions of vinyl radicals and hydrogen atoms from the photolysis of vinyl iodide (C 2 H 3 I) at 193 nm have been examined employing laser photolysis coupled to kinetic‐absorption spectroscopic and gas chromatographic product analysis techniques. The time history of vinyl radicals in the presence of hydrogen atoms was monitored using the 1,3‐butadiene (the vinyl radical combination product) absorption at 210 nm. By employing kinetic modeling procedures a rate constant of 1.8 × 10 −10 cm 2 molecule −1 s −1 for the reaction C 2 H 3 + H has been determined at 298 K and 27 K Pa (200 torr) pressure. A detailed error analysis for determination of the C 2 H 3 + H reaction rate constant, the initial C 2 H 3 and H concentrations are performed. A combined uncertainty of ±0.43 × 10 −10 cm 2 molecule −1 s −1 for the above measured rate constant has been evaluated by combining the contribution of the random errors and the systematic errors (biases) due to uncertainties of each known parameter used in the modeling. © 1995 John Wiley & Sons, Inc.