C2(X1Σg+)自由基与不饱和碳氢化合物反应的温度效应

doi:10.3866/PKU.WHXB201302046

Abstract

Abstract:

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.

Key words: C₂(X¹Σ_g⁺) radical, Laser induced fluorescence, Rate constant, Temperature dependence

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 Phys. -Chim. Sin. 2013, 29(04), 683-688. doi: 10.3866/PKU.WHXB201302046

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

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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