Abstract

Spectrograms which illustrate energy distribution were prepared of green flames produced by pyrotechnic compositions. The observed suppression of MgO and BaO emission is a decreasing function of the effective emitting temperature of the flame. The ratio BaO/BaCl is shown to be an increasing function of effective emitting temperature, accompanied by a shift of hue toward yellow and a reduction in excitation purity. By analogy to BaF and BaOH, it is proposed that the BaCl dissociation energy is near 100 kcal/mole. Although evidence concerning the emission contribution of BaOH is inconclusive, it is suggested that BaOH is a substantial contributor. The effective emissivity is estimated for each of the test groups. The experiments verify that brightness temperatures less than 2200°K are required for satisfactory green-flame production and demonstrate that polyvinyl chloride is more effective than potassium perchlorate when used as a chlorine donor in green pyrotechnic flames.

© 1965 Optical Society of America

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