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Issue 33, 2009
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Product branching fractions for the reaction of O(3P) with ethene

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Abstract

The product branching fractions for the reaction of atomic oxygen with ethene, O(3P) + C2H4→ CH3 + HCO (1a), → H + CH2CHO (1b), → H2 + CH2CO (1c), have been investigated at room temperature (295 ± 4 K) and pressures from 1 to 4 Torr (with N2 or He buffer) by a laser photolysis–photoionization mass spectrometry method. From the yield of CH3 radical, ϕ(CH3), the branching fraction for (1a) was determined to be 0.53 ± 0.04 and no apparent pressure dependence was found from 1.5 to 4.0 Torr (N2buffer). The ratio of the HCO yield to that of CH3, ϕ(HCO)/ϕ(CH3), was measured to be less than unity and increased as pressure increased (∼0.7 at 1 Torr and ∼0.9 at 4 Torr [He]) suggesting prompt dissociation of the hot HCO radical (to H + CO) formed by channel (1a) at low pressures. An interpretation which reduces the large discrepancy among branching fractions reported for low pressure region is presented. The existence of the molecular H2-elimination channel (1c) was confirmed. The branching fraction for channel (1c) was determined to be 0.019 ± 0.001 by the yield of CH2CO and was independent of pressure from 1.0 to 4.0 Torr (He buffer). As a side result, the yield of CH3 radical from O(1D) + C2H4 reaction was also determined.

Graphical abstract: Product branching fractions for the reaction of O(3P) with ethene

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Article information


Submitted
23 Mar 2009
Accepted
22 May 2009
First published
19 Jun 2009

Phys. Chem. Chem. Phys., 2009,11, 7318-7323
Article type
Paper

Product branching fractions for the reaction of O(3P) with ethene

A. Miyoshi, J. Yoshida, N. Shiki, M. Koshi and H. Matsui, Phys. Chem. Chem. Phys., 2009, 11, 7318
DOI: 10.1039/B905787K

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