Abstract
The reaction of nitrogen atoms, produced by an electric discharge, with acetaldehyde has been studied in a flow system, a mass spectrometer being used to follow the course of the reaction. Sampling was carried out through a small hole in a gold diaphragm. The main stable products were HCN, H
2
and CO; a small amount of glyoxal was also formed. In addition appreciable amounts of a substance yielding ions of
m/e
= 43 were obtained. Arguments are presented for identifying this with the radical CH
2
CHO. Small amounts of a product giving ions of
m/e
= 86 were also produced. The nature of this material is discussed. No evidence was obtained for any hydrogen abstraction by nitrogen atoms. Experiments were also carried out with CH
3
CDO to clarify certain aspects of the proposed reaction mechanism . A few experimental results obtained with propionaldehyde can be understood in similar terms. The rate constant of the reaction N + CH
3
CHO → HCN + H
2
+ HCO was deduced to be 1.20 ± 0.15 x 10
10
mole
-1
cm
3
s
-1
at 296°K.
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