The Measurements of Quenching Rate Constants of Electronically Excited State CH (C2Σ+) Radical

Abstract

Abstract: The rate constants for quenching of CH (C₂Σ⁺,v'=0) by O₂,N₂,n-C₅H₁₂,n-C₆H₁₄ and n-C₇H₁₆ molecules were measured at room temperature.CH (C₂Σ+) was produced by 266 nm laser photolysis of CHBr₃ and the total fluorescence intensity of CH(C→X) at (314.8±1) nm was then monitored using a fast digital storage oscilloscope coupled with a microcomputer.The rate constants (k) for the total removal of CH (C)are compared with those of CH (X,A,B) states,and show to be k (X)>k(B) and k(C)for alkane quenchers,and the tendency of quenching rate constants for CH(C) is similar to those for CH(X,A,B)showing the increase with increasing the number of C-Hbonds in alkane molecules.The results indicate that the quenching of CH (A,B,C)is probably the entrance-channel controlled process and the chemical reaction might play an important role in collisional quenching of CH (A,B,C).

Key words: CH radical, Alkane molecule, O₂, N₂, Quenching

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RAN Qin, CHEN Cong-Xiang, ZHANG Qun, YU Shu-Qin, LI Yue-Han, MA Xing-Xiao. The Measurements of Quenching Rate Constants of Electronically Excited State CH (C²Σ⁺) Radical[J]. Chem. J. Chinese Universities, 1996, 17(3): 456.

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The Measurements of Quenching Rate Constants of Electronically Excited State CH (C²Σ⁺) Radical

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