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

文献情報

出版日 2009-06-19

DOI 10.1039/B905787K

インパクトファクター 3.676

著者

Akira Miyoshi, Jun-ichi Yoshida, Naoya Shiki, Mitsuo Koshi

原文を見る

要旨

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.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.