Atomic halogen elimination from halogen-related compounds plays a vital role in the depletion of the ozone layer and is well investigated. However, the probabilities for elimination of molecular halogens and hydrogen halides are rarely scrutinised. We develop distinct method for the investigation of each kind of fragment. Velocity-mapping ion-imaging was employed to study the atomic halogen elimination from alkyl halides and aryl halides, focusing on the fractions of the translational energy release, the quantum yields of the atomic fragments, transition probability for curve crossing, competitive halogen-related bond fission, and anisotropy parameters to understand their dynamical complexity. Cavity ring-down absorption spectroscopy was implemented to investigate the molecular halogen fragments dissociated from the aliphatic halides and acyl halides for their optical spectra, vibrational branches, quantum yields, and the dissociation mechanisms. Time-resolved Fourier transform infrared emission spectroscopy was employed to confine the primary products of hydrogen halide elimination from acyl halides in the presence of Ar gas. It is, for the first time, to overview these existing small halogen-related fragments eliminated from halogen-containing compounds. The detailed characterisation of these fragments should unveil complicated halogen-related dissociation mechanisms which may supplement the current knowledge and help with the photochemical assessment of halogen-related environmental issue.

中文翻译：

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大气中与卤素相关的光解：原子卤素、分子卤素和卤化氢的表征

从卤素相关化合物中消除原子卤素在臭氧层消耗方面起着至关重要的作用，并且已得到充分研究。然而，很少有人仔细研究消除分子卤素和卤化氢的可能性。我们开发了不同的方法来调查每种碎片。使用速度映射离子成像研究卤代烷和芳基卤化物的原子卤素消除，重点关注平移能量释放的分数，原子碎片的量子产率，曲线交叉的跃迁概率，竞争性卤素相关键裂变和各向异性参数以了解它们的动力学复杂性。实施腔衰荡吸收光谱来研究从脂肪族卤化物和酰基卤化物解离的分子卤素碎片的光谱、振动分支、量子产率和解离机制。时间分辨傅立叶变换红外发射光谱用于限制在 Ar 气体存在下从酰基卤中消除卤化氢的主要产物。这是第一次概述从含卤素化合物中消除的这些现有的与卤素相关的小片段。这些碎片的详细表征应该揭示复杂的卤素相关解离机制，这可以补充当前的知识并有助于卤素相关环境问题的光化学评估。振动分支、量子产率和解离机制。时间分辨傅立叶变换红外发射光谱用于限制在 Ar 气体存在下从酰基卤中消除卤化氢的主要产物。这是第一次概述从含卤素化合物中消除的这些现有的与卤素相关的小片段。这些碎片的详细表征应该揭示复杂的卤素相关解离机制，这可以补充当前的知识并有助于卤素相关环境问题的光化学评估。振动分支、量子产率和解离机制。时间分辨傅立叶变换红外发射光谱用于限制在 Ar 气体存在下从酰基卤中消除卤化氢的主要产物。这是第一次概述从含卤素化合物中消除的这些现有的与卤素相关的小片段。这些碎片的详细表征应该揭示复杂的卤素相关解离机制，这可以补充当前的知识并有助于卤素相关环境问题的光化学评估。时间分辨傅立叶变换红外发射光谱用于限制在 Ar 气体存在下从酰基卤中消除卤化氢的主要产物。这是第一次概述从含卤素化合物中消除的这些现有的与卤素相关的小片段。这些碎片的详细表征应该揭示复杂的卤素相关解离机制，这可以补充当前的知识并有助于卤素相关环境问题的光化学评估。时间分辨傅立叶变换红外发射光谱用于限制在 Ar 气体存在下从酰基卤中消除卤化氢的主要产物。这是第一次概述从含卤素化合物中消除的这些现有的与卤素相关的小片段。这些碎片的详细表征应该揭示复杂的卤素相关解离机制，这可以补充当前的知识并有助于卤素相关环境问题的光化学评估。