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Title: Kinetics of formation of chemiluminescent CH(A(2)Delta) by the elementary reactions of C2H(X(2)Sigma(+)) with O(3P) and O2(X(3)Sigma(g)(-)): A pulse laser photolysis study
Authors: Devriendt, Katia
Van Look, Hilde
Ceursters, Benny
Peeters, Jozef # ×
Issue Date: Jan-1996
Publisher: Elsevier science bv
Series Title: Chemical Physics Letters vol:261 issue:4-5 pages:450-456
Abstract: The C2H(X(2) Sigma(+))+O(P-3)-->CH(A(2) Delta)+CO reaction channel has been proposed as a source of the 430 nm CH* chemiluminescence in hydrocarbon flames and in C2H2/O/H systems. We present the first measurement of its rate constant. The reactants were generated in known amounts by co-photolysis of C2H2 and N2O at T=295 K by 193 nm ArF excimer laser pulses. The presence of a large excess of N-2 ensured that both C2H and O were in their X(2) Sigma(+) and P-3 ground states within 1 mu s. The intensity of the resulting CH(A(2) Delta-->X(2) Pi) luminescence was measured, up to 40 mu s after the excimer pulse, using a 429.5+/-4.0 nm interference filter and a photomultiplier. Calibration was achieved via the known spectral photon yield of the NO+O(P-3)+M-->NO2*+M reaction. The rate constant of the CH(A(2) Delta) forming channel was determined to be (1.8+/-0.7)x10(-11) cm(3) molec(-1) s(-1). The rate constant of the C2H(X(2) Sigma(+))+O-2-->CH(A(2) Delta)+CO2 reaction channel was found to be (3.6+/-1.4)x10(-14) cm(3) molec(-1) s(-1) .
ISSN: 0009-2614
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Quantum Chemistry and Physical Chemistry Section
× corresponding author
# (joint) last author

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