Kinetic Studies on State-state Transitions for ·CCl2(X1A1,A1B1,a3B1) Radical and Quenching of ·CCl2(A1B1 and a3B1) with Methane and Chloromethane

Abstract

Abstract: CCl₂ free radicals were produced by d-c discharge of CCl₄(in Ar). The ground electronic state CCl₂ radical was electronically excited to ^pR₁ level of A¹B₁(0,4,0) state by laser exciting at 541.52 nm. Experimental quenching data of·CCl₂(A¹B₁ and a³B₁) through methane and chloromethane were obtained by observing time resolved fluorescence from the excited ·CCl₂ transition, which showed a superposition of two exponential decay components. The state resolved rate constants k^q1, k^q2 and k^q3 were first time estimated by analyzing and dealing with these data by using three level energy model, which was put forward by us. In combining discharge with free jet LIFthe lifetimes of·CCl₂(A→X) and(a→X) transition were measured being(0.83±0.03) μs and(3.12±0.25) μs, respectively.

Key words: CCl₂(A¹B₁, a³B₁), Chloromethane, Quenching rate constant, Fluorescence lifetime, Three level energy model

CLC Number:

O643.2

TrendMD:

GAO Yi-De, CHEN Yang, PEI Lin-Sen, MA Hua-Qiang, MA Xing-Xiao, CHEN Cong-Xiang . Kinetic Studies on State-state Transitions for ·CCl₂(X¹A₁,A¹B₁,a³B₁) Radical and Quenching of ·CCl₂(A¹B₁ and a³B₁) with Methane and Chloromethane[J]. Chem. J. Chinese Universities, 2001, 22(6): 1006.

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Kinetic Studies on State-state Transitions for ·CCl₂(X¹A₁,A¹B₁,a³B₁) Radical and Quenching of ·CCl₂(A¹B₁ and a³B₁) with Methane and Chloromethane

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