摘要
本文研究了气态CF_2ClBr在253.7nm紫外光照下的光解离过程及光氧化机理.CF_2ClBr-O_2体系光解离的主要产物CF_2O,Cl_2和Br_2,另外还有少量的CO_2,SiF_4生成;该体系中CF_2ClBr的解离为一级反应,光解离速率常数为1.89×10^(-5)s^(-1);CF_2ClBr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.
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.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1997年第3期277-284,共8页
Acta Chimica Sinica
基金
国家自然科学基金资助项目
