Yol. 66 before it became difficult to compensate the falling temperature and yet maintain a constant . When N2 was added, the base flame did show a barely detectable increase in a. If this is due to an increase in reaction 5 owing to the elevation of [N2] in the flame, it is estimated / •8 ( 2)^6 X 10-32 cm.6 molecule-2 sec.-1 and the ratio /cspolo)/ /t'5P(N!) is approximately 7, which is of the same order as that measured in the low-temperature iodine atom studies.This technique shows some promise of at least partial separation of the many ternary constants involved in hydrocarbon flames such as this and more useful information will follow from a study over a reasonable range of temperatures. Flames near stoichiometry where 0>1 on a properly designed burner are interesting as some measurements might be made for II2 and CO directly. We are grateful to the National Research Council of Canada for a grant in aid of this research.
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