Citation: HU Ren-Zhi, XIE Pin-Hua, ZHANG Qun, SI Fu-Qi, CHEN Yang. Temperature Dependence of C₂(X¹Σ_g⁺) in Reactions with Unsaturated Hydrocarbons[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201302046 shu

Temperature Dependence of C₂(X¹Σ_g⁺) in Reactions with Unsaturated Hydrocarbons

HU Ren-Zhi ^1, ,
XIE Pin-Hua ¹ ,
ZHANG Qun ² ,
SI Fu-Qi ¹ ,
CHEN Yang ^2,

1.
1 Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Science, Hefei 230031, P. R. China;
2 Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China

Received Date: 30 November 2012
Available Online: 4 February 2013
Fund Project: 国家自然科学基金(61108031, 21173205) (61108031, 21173205) 国家重点基础研究发展规划项目(973) (2010CB923302) (973) (2010CB923302)中国科学院知识创新工程(KJCX2-YW-N24)资助 (KJCX2-YW-N24)

Bimolecular rate constants for the gas-phase reactions of C₂(X¹Σ_g⁺) with unsaturated hydrocarbons C₂H₄ and C₂H₂ were measured over the temperature range 293-573 K by pulsed laser photolysis/laserinduced fluorescence (PLP-LIF). The rate constants, in the unit of cm³·molecule^-1·s^-1, can be fitted by the normal Arrhenius expressions: k(C₂H₄)=(1.16±0.10)×10^-10exp[(290.68±9.72)/T], and k(C₂H₂)=(1.36±0.02)×10^-10exp[(263.85 ± 7.60)/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 conclude that the reactions of C₂(X¹Σ_g⁺) with these unsaturated hydrocarbons in the temperature range 293- 573 K proceed via an addition mechanism.
- C₂(X¹Σ_g⁺) radical,
- Laser induced fluorescence,
- Rate constant,
- Temperature dependence
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Temperature Dependence of C2(X1Σg+) in Reactions with Unsaturated Hydrocarbons

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Temperature Dependence of C₂(X¹Σ_g⁺) in Reactions with Unsaturated Hydrocarbons