【摘要】 本文研究了气态CF₂ClBr在253.7nm紫外光照下的光解离过程及光氧化机理.CF₂ClBr-O₂体系光解离的主要产物CF₂O,Cl₂和Br₂,另外还有少量的CO₂,SiF₄生成;该体系中CF₂ClBr的解离为一级反应,光解离速率常数为1.89×10^-5s^-1;CF₂ClBr的表观量子产率近似为1.在这些基础上讨论了光解离过程及光氧化机理.更多还原

【Abstract】 This paper studied the photo - dissociation and photo - oxidation of CF2ClBr vapor at 253.7nm. The CF2ClBr - O2 system under photo - dissociation condition gives major products such as CF2O,Cl2,Br2, minor ones e. g. CO2 and SiF4. The dissociation of CF2ClBr is a first -order reaction and the corresponding rate constant is about 1.89×10-5 s-1. The apparent quantum yield of CF2ClBr is about unit. Based on the experimental results, the photo - dissociation process, the photo - oxidation mechanism of CF2ClBr and the change of CF2ClBr after being delivered into the stratosphere were discussed.更多还原