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Isotopically labelled atomic oxygen, produced by the photolysis of N1802 at 3660& was allowed to react with CO, C02, N20, 0 2 and COC4, respectively. The rates and mechanisms of the exchange reactions are discussed. The specific rate constants were determined for the process, O*+XO +O*X+O. They are 6 . 2 ~ 1010 exp [(-6900&700)/RT], 6.3 x 108 exp [(-3500f200)/RT], 9 . 6 ~ 108 exp [(-4400f800)/RT], and 3.9 x 109 exp [(-1100+400)/RT] 1. mole-1 sec-1 for CO, C02, N20 and 0 2 respectively.

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The rates of thermal and photochemical reactions of butyraldehyde with NO2 were measured. The thermal rate constant was determined to be 107•4 exp (-12,400/ RT) lm-1 sec-1. The rate constant for the reaction of oxygen atoms with butyraldehyde was determined to be 1.5 X 10s lm"1 sec-1 at 25°C. These results are close to those for the lower-molecular-weight aldehydes and indicate that they may all be treated by means of one general mechanism. 530 (1973).

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