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The rate of acetaldehyde photolysis in presence of acetone showed an increase due to chain initiation by methyl radicals from the photo-decomposition of the acetone. In the presence of formaldehyde the acetaldehyde rate decreased, implying that the decomposition of formyl radicals was slower than that of acetyl. Glyoxal photolysis at long wavelengths confirmed previously found low ratios of H2 to CO. Added acetaldehyde and formaldehyde decreased the rate of the photolysis possibly owing to collisional deactivation of excited glyoxal molecules.
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Dorman et al. (1956) studied this question.
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