The Collisional Quenching of CCl2(A1B1) in Different Vibrational States by Alcohols and Ketones

Abstract

Abstract: CCl₂ free radicals were produced by dc discharge of CCl₄(in Ar). Ground electronic state CCl₂ radical was electronically excited to A¹B₁(0, 3, 0), (0, 4, 0), (1, 3, 0), (0, 6, 0), (1, 4, 0) and (2, 2, 0) vibronic states by Nd∶YAGlaser pumped dye laser at 550.56, 541.52, 532.25, 524.31, 523.82 and 523.37 nm respectively. The experimental quenching data of CCl₂( A¹B₁and a³B₁) by alcohols and ketones were obtained by observing time resolved fluorescence from the excited CCl₂ radicals transition, which showed a superposition of two exponential decay components. The state-resolved rate constants k_A and k_a were acquired by analyzing and dealing with these data by using three-level model, which was put forward by us. It is found that the quenching rate constant is not dependent on the vibrational state.

Key words: CCl₂( A¹B₁, a³B₁), Kinetics, Quenching rate constant, Three level model

CLC Number:

O643.2

TrendMD:

GAO Yi-De, CHEN Yang, Yang-Xue-Liang, CHEN Cong-Xiang . The Collisional Quenching of CCl₂(A¹B₁) in Different Vibrational States by Alcohols and Ketones[J]. Chem. J. Chinese Universities, 2002, 23(7): 1339.

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The Collisional Quenching of CCl₂(A¹B₁) in Different Vibrational States by Alcohols and Ketones

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