Photolysis of Acetaldehyde and Iodine Mixtures 893 a trace of hydrogen is formed, (2) that acetyl iodide is not formed, and (3) that hydrogen iodide is produced in considerable quantity.6. These results are interpreted to mean that, at X3130: (1) the formation of free methyl and formyl groups is the only important primary dissociation process, (2) iodine reacts readily with both methyl and formyl radicals, thus stopping all normal secondary processes, (3) iodine does not react readily with activated acetaldehyde molecules, (4) the recombination of methyl and formyl radicals in normal photolysis does not occur to any great extent, (5) the primary dissociation quantum yield, , equals 00 and , , and is approximately 0.20, and (6) collisional deactivation accounts for a large portion of the total absorbed radiant energy.
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