Abstract

The process of Infrared Multiphoton Dissociation (IRMPD) was studied in a mixture of vinyl bromide/chlorodifluoromethane (VBr, C₂H₃Br/CF₂HCl) using single and double infrared pulsed transverse excitations atmospheric CO₂ laser beams. The dissociation of VBr was investigated using FTIR, and the product composition was analysed, and various dissociation routes were proposed. The study found that the VBr molecules were more heavily dissociated when exposed to the CF₂HCl environment than without it. By using a time-resolved LIF, the kinetics reactions with CF₂HCl were explored under pseudo-first-order conditions, and the quenching rate constant for the interaction between CF₂HCl and \({{\text{C}}}_{2}\left({{\text{d}}}^{3}{\Pi }_{{\text{g}}}\right)\) was published using the classical Stern–Volmer model. The impact of pulsed laser heating on the generation of \({{\text{C}}}_{2}\left({{\text{a}}}^{3}{\Pi }_{{\text{u}}}\right)\) radicals was also observed. The decrease in the intensity of the \({{\text{C}}}_{2}({{\text{a}}}^{3}{\Pi }_{{\text{u}}})\) LIF signal was due to faster recombination of the \({{\text{C}}}_{2}\left({{\text{a}}}^{3}{\Pi }_{{\text{u}}}\right)\) radicals, together with a decrease in \(V-V{\prime}\) energy transfer and the pressure oscillations produced by the effect of pulsed laser heating in the irradiated volume and the experimental conditions.

Graphical abstract

中文翻译：

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$${{\text{C}}}_{2}\left({{\text{a}}}^{3}{\Pi }_{{\text{u}}}\的二色性辐照研究右）$$ 用 TEA CO2 激光加热 C2H3Br/CF2HCl 混合物形成自由基

摘要

使用单和双红外脉冲横向激发大气CO ₂激光束，在溴乙烯/二氟氯甲烷（VBr、C ₂ H ₃ Br/CF ₂ HCl）混合物中研究了红外多光子解离（IRMPD）过程。使用 FTIR 研究了 VBr 的解离，并分析了产物组成，并提出了各种解离路线。研究发现，与没有接触 CF _{2 HCl 环境时相比，VBr 分子在接触 CF 2} HCl 环境时解离得更严重。通过使用时间分辨LIF，在准一级条件下探索了CF _{2 HCl的动力学反应，以及CF 2} HCl与\({{\text{C}}}_之间相互作用的猝灭速率常数{2}\left({{\text{d}}}^{3}{\Pi }_{{\text{g}}}\right)\)是使用经典的 Stern–Volmer 模型发布的。脉冲激光加热对\({{\text{C}}}_{2}\left({{\text{a}}}^{3}{\Pi }_{{\text还观察到了{u}}}\right)\)自由基。 \({{\text{C}}}_{2}({{\text{a}}}^{3}{\Pi }_{{\text{u}}}强度的降低)\) LIF 信号是由于\({{\text{C}}}_{2}\left({{\text{a}}}^{3}{\Pi }_{{ \text{u}}}\right)\)自由基，以及\(VV{\prime}\)能量转移的减少以及脉冲激光加热在照射体积和实验条件下产生的压力振荡。

图形概要