Abstract

With the aid of the automatic-feed strand bomb previously described [ R. G. Rekers and D. S. Villars, Rev. Sci. Instr. 25, 424– 429 ( 1954)], spectra of JPN burning in nitrogen have been investigated over the visible and ultraviolet. Throughout the pressure range, 300 to 500 psi nitrogen, emission from the flame zone exhibits a continuous background which extends into the ultraviolet to approximately 3200 A. Accompanying this continuum are some of the more prominent lines of spectra due to sodium, potassium, calcium, copper, and iron. Calcium oxide bands in the 6260 region (orange system) and in the 5500 region (green system) have been identified. Furthermore, a multitude of weak lines is observed in the wavelength region, 4600 to 5800 A. Both the Swan and the high-pressure bands attributed to C2 appear to be present in this flame. The dividing line between flame and fizz zones does not appear to be sharp.

No absorption in the visible region has been found in the fizz zone over the pressure range, 25 to 150 psi nitrogen. NO2 absorption originally noted has been shown to originate from the external atmosphere surrounding the flame. Absence of nitrogen dioxide from the fizz zone is highly significant with respect to theories of reaction mechanism, which usually assume as primary step the formation of nitrogen dioxide and a radical from a nitrate. The present demonstration indicates that formation of NO2 is a secondary reaction.

© 1956 Optical Society of America

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