Abstract
The mechanism of the formation of BrO and CIO in the flash photolysis of halogen + oxygen mixtures was investigated. It was found that the predominant mechanism for the production of BrO (about 90 % in our experiments) involves the absorption of light by the oxygen molecules. The O*
2
or the oxygen atoms produced create ozone, which in turn produces BrO when photolyzed. It is possible that some of O*
2
or O produces BrO directly and not via an ozone intermediate. About 10 % of the BrO is produced when two quanta of radiant energy are absorbed by the Br
2
molecule. The highly energetic molecule formed in this way is capable of breaking the O—O bond and forming BrO. The reaction between the excited Br atoms and O
2
, suggested by Durie & Bamsey (1958), does not occur. It seems likely that IO is formed by a mechanism similar to that of BrO. On the other hand, CIO is produced predominantly in a reaction of Cl(
2
P
) atoms with O
2
, as suggested by Porter & Wright (1953). Chlorine and bromine absorption spectra were measured down to 1880 and 1930 Å, respectively.
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