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本文用激光光解－荧光猝灭方法测定了ＣＨ３Ｃｌ对ＣＨ（Ａ，Ｂ和Ｃ）及ＣＨ２Ｃｌ２、ＣＨＣｌ３和ＣＣｌ４对ＣＨ（Ｃ）的猝灭速率常数。结果表明，氯代甲烷分子对ＣＨ（Ｃ）的猝又速率常数近似于ＣＨ（Ｂ）的猝灭速率常数，而比ＣＨ（Ａ）的猝灭速率常数大，但都具有与气动速率相当的量级，表明化学反应在其中可能起着重要的作用，且ＣＨ（Ａ，Ｂ，Ｃ）的猝灭速率常数都随氯代甲烷分子中的Ｃ－Ｃｌ键数的增加而增大。我们用碰撞络合物模型计算了氯代甲烷分子与ＣＨ（Ａ，Ｂ）形成碰撞络合物时的生成截面，结果表明在电子激发态ＣＨ的猝灭过程中多极吸引势起着重要作用，且该过程属于入口通道控制的猝灭机制。
In this paper, the quenching rate constants of CHCl3 to CH (A, B and C) and CH2Cl2, CHCl3 and CCl4 to CH (C) were determined by laser photolysis-fluorescence quenching method. The results show that the quenching and rate constant of CH (C) molecules are close to the quenching rate constant of CH (C) and larger than the quenching rate constant of CH (A), but both of them have the same rate of aerodynamic velocity Order of magnitude, indicating that chemical reactions may play an important role in them, and the quenching rate constants of CH (A, B, C) all increase with the increase of the number of C-Cl bonds in methyl chloride molecules. Using the collisional complex model, we calculated the cross section of the formation of the collisional complex of CH 4 and CH (A, B). The results show that multipole attractive potential plays an important role in the quenching of electron-excited CH , And this process belongs to the quenching mechanism of inlet channel control.