Tropospheric photolysis of CF3CHO

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Trifluoroacetaldehyde, CF3CHO, is an atmospheric degradation product of several chlorofluorocarbon (CFC) alternatives. It is important to understand the further fate of CF3CHO in the atmosphere. There is conflicting information on the CF3CHO photolysis in the literature. In this chamber study, the tropospheric photolysis of CF3CHO was investigated using broadband actinic radiation and FTIR spectroscopy for detection of the photolysis products. The photolysis produces CF3 radicals in a yield of unity, which under atmospheric conditions gives dominantly COF2 with smaller yields of oxides, alkoxy nitrates or per oxynitrates. No formation of CF3H, HFC-23, was observed under any of the experimental conditions and an estimated upper limit for the yield of HFC-23 of 0.3 % was established. Our results are in contradiction to those published most recently, which claimed to have observed HFC-23, and which has created a lot of debate in the scientific community. This is the first study of broadband UV photolysis of CF3CHO, combined with FTIR detection of CF3H.
TidsskriftAtmospheric Environment
Antal sider6
StatusUdgivet - jan. 2022

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