The infrared radiance from the plume of an aluminized rocket is anomalously high; however, the responsible physical mechanism is not known. In this paper, the conclusion is reached that the high emissivity is most likely due to the A12O3 particulates containing very small amounts of aluminum and/or carbon impurities. To support this conclusion, experimental results of the radiance from single-alumina particles are discussed and calculated emissivity spectra of microscopic composite particles of alumina-carbon and alumina-aluminum are presented.
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Pluchino et al. (1981) studied this question.
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