The Kinetic Study on Collisional Quenching of CH(B2Σ-)by Halomethane,CS2,O2 and Ar Molecules

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (10): 1525.

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The Kinetic Study on Collisional Quenching of CH(B²Σ^-)by Halomethane,CS₂,O₂ and Ar Molecules

CHEN Cong-Xiang, SHENG Yue, DAI Ji-Xun, MA Xing-Xiao

Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026

Received:1993-11-06 Revised:1994-03-21 Online:1994-10-24 Published:1994-10-24

Abstract

Abstract: CH(B²Σ^-)radical was produced by quadrupuled YAGlaser(266 nm)photolysis of CHBr₃ molecules.The quenching rate constants by halomethane(CH₂Cl₂, CHCl₃, CCl₄ and CHBr₃), CS₂, O₂, and Ar were determined at room temperature by monitoring the time-resolved emission CH(B→X)signals.The measured results(in₁₀^-10cm³·molec^-1·s^-1)are 4.4±0.7(CH₂Cl₂), 5.2±0.4(CHCl₃), 5.0±0.7(CCl₄), 8.2±0.3(CHBr₃), 7. 9±0.7(CS₂), 0.19±0.02(O₂), and(1.1±0.1)×10^-2(Ar), respectively。It is shown that the quenching rate constant of CH(B)is faster than that of CH(A)except for O₂ molecule.The quenching rate constant of CH(B)increases with increasing the number of chlorine atoms contained in chloromethane molecules and an interpretation of this result based on complex model is presented.

Key words: CH radical, Quenching, Kinetics

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CHEN Cong-Xiang, SHENG Yue, DAI Ji-Xun, MA Xing-Xiao. The Kinetic Study on Collisional Quenching of CH(B²Σ^-)by Halomethane,CS₂,O₂ and Ar Molecules[J]. Chem. J. Chinese Universities, 1994, 15(10): 1525.

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The Kinetic Study on Collisional Quenching of CH(B²Σ^-)by Halomethane,CS₂,O₂ and Ar Molecules

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