Citation: HU Ren-Zhi, ZHANG Qun, CHEN Yang. Temperature Dependence of Reactions of C₂(a³Π_u) Radical with Several Unsaturated Hydrocarbons[J]. Acta Physico-Chimica Sinica, ;2010, 26(10): 2619-2624. doi: 10.3866/PKU.WHXB20100938 shu

Temperature Dependence of Reactions of C₂(a³Π_u) Radical with Several Unsaturated Hydrocarbons

1.
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science andTechnology of China, Hefei 230026, P. R. China

Received Date: 7 April 2010
Available Online: 27 September 2010
Fund Project: 国家自然科学基金(20673107, 20873133) (20673107, 20873133) 国家重点基础研究发展规划项目(973)(2007CB815203, 2010CB923302) (973)(2007CB815203, 2010CB923302)中国科学院知识创新工程(KJCX2-YW-N24)资助 (KJCX2-YW-N24)

We studied the temperature dependence on the gas phase reactions of theC₂(a³Π_u) radical with several unsaturated hydrocarbons (C₂H₄ (k₁),C₂H₂ (k₂),C₃H₆ (k₃), and 2-C₄H₈ (k₄)) by means of pulsed laser photolysis-laser induced fluorescence (PLP-LIF) technique. The bimolecular rate constants for these reactions were obtained in the temperature range of 298-673 K. The obtained kinetics data were used to derive the following Arrhenius expressions: k₁(T)=(4.53 ±0.05) ×10^-11exp[(196.41 ±5.20)/T], k₂(T)=(3.94 ±0.04) ×10^-11exp[(143.04 ±4.28)/T], k₃(T)=(7.96 ±0.17) ×10^-11exp[(185.10 ±8.86)/T], and k₄(T)=(1.04 ±0.02) ×10^-10exp[(180.34 ±7.67)/T], where all error estimates are ±2σ and represent the precision of the fit. The observed bimolecular rate constants along with the negative temperature dependences of k(T) allow us to reacha conclusion that the reactions of C₂(a³Π_u) with these unsaturated hydrocarbons in the temperature range of 298-673 K proceed via an addition mechanism.
- C₂(a³Π_u) radical,
- Laser induced fluorescence,
- Rate constant,
- Temperature dependence
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沈阳化工大学材料科学与工程学院沈阳 110142

Temperature Dependence of Reactions of C2(a3Πu) Radical with Several Unsaturated Hydrocarbons

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Temperature Dependence of Reactions of C₂(a³Π_u) Radical with Several Unsaturated Hydrocarbons